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  "plan": "# Plan: Multi-tenant Auth Refactor (reviewed)\n\nReviewed by /plan-eng-review on 2026-09-10 against PLAN.md at commit 7007835.\nScope was reduced (D4). Six findings, all folded into this plan with the complete remedy.\n\n## Context\n\n**Problem (inferred, author must confirm — see Prerequisite P0 below).** The current auth path\nvalidates tokens with 5 sequential IDP calls, swallows three classes of error inside\n`validateAndDispatch()`, and mixes tenant-scoped session logic into a single `legacyAuthFlow()`.\nThe refactor introduces two focused services, `AuthBroker` (mints and stores tokens) and\n`SessionMint` (establishes sessions from cached or freshly minted tokens), on top of the\nexisting tenant-keyed cache adapter.\n\n**Goal (draft).** Every tenant's login and token validation runs through one explicit,\nobservable path with bounded latency and no silent failures, while the two invariants below\nhold at all times.\n\n**Invariants (draft, must be asserted by tests).**\n1. No cross-tenant reads: a token stored under tenant A's key is never returned for tenant B.\n2. No resurrection: once a token is invalidated (logout, revocation, tenant suspension, policy\n   version bump), no in-flight write can put it back.\n\n**Latency target (draft).** Token validation p95 bounded by the slowest single IDP call plus\ncache lookup, not by the sum of five calls. Author to fill in the number.\n\n### Prerequisite P0 (decision D7 → 3A)\nImplementation does not start until the author confirms or edits the Problem, Goal,\nInvariants and Latency target above. Estimated: human ~30 min / CC ~5 min.\n\n## Existing contracts retained (unchanged from PLAN.md)\n\nThe existing cache adapter keys entries by tenant ID, issuer, audience, and policy version.\nIt evicts expired tokens and invalidates entries on logout, token revocation, or tenant\nsuspension. It does not serialize mutations. The adapter, its invalidation hooks, and their\nexisting tests remain in use unchanged. The new services receive the adapter by constructor\ninjection; nothing new wraps it.\n\n## Architecture (as reviewed)\n\n### Scope (decision D4 → A)\nPLAN.md proposed 12 files and five new types (`AuthBroker`, `SessionMint`, `TokenStore`,\n`AuthCache`, `RequestPolicy`). Reduced to **two new types**:\n\n| Proposed type | Outcome | Reason |\n|---|---|---|\n| `AuthBroker` | **Keep** | The only writer to the cache; mints tokens via the IDP. |\n| `SessionMint` | **Keep** | Reads the cache; asks `AuthBroker` to mint on miss. |\n| `AuthCache` | **Drop** | PLAN.md:11-13 describes a pass-through facade over the existing adapter with one backing cache. The adapter is injected directly instead. |\n| `TokenStore` | **Drop** | Overlaps the adapter's token storage role. |\n| `RequestPolicy` | **Defer** | No consumer named anywhere in the plan. Captured as TODO 1. |\n\nEstimated diff: ~7 files.\n\n### Component and data flow\n\n```\n                    per-tenant flag (D6)\n   request ──────────┬─────────────────────────────┐\n                     │ flag OFF                    │ flag ON\n                     ▼                             ▼\n             legacyAuthFlow()              validateAndDispatch()  (typed pipeline, D8)\n             (unchanged, kept              ├─ parse token        → Result\n              until TODO 2)                ├─ verify signature   → Result   (JWKS cache, D10)\n                     │                     ├─ check tenant policy→ Result\n                     │                     └─ dispatch           → Result\n                     │                                │\n                     │                                ▼\n                     │                     ┌──── error boundary ────┐\n                     │                     │ maps each error class  │\n                     │                     │ → outcome + log + metric│\n                     │                     └────────────────────────┘\n                     │                                │\n                     ▼                                ▼\n               existing adapter  ◄──read──  SessionMint ──mint?──► AuthBroker ──write(gen)──► existing adapter\n               (tenant-keyed,                                          │                      (same instance,\n                invalidation hooks)                                    ▼                       injected)\n                                                          IDP calls (parallel, shared AbortSignal,\n                                                          per-call timeout; discovery + JWKS cached)\n```\n\n### Issue 1 — Shared cache mutated by two services with no ordering (decision D5 → 1A)\n`[P1] (confidence: 8/10) PLAN.md:19-20, PLAN.md:10` — \"Both services mutate it\" and \"they do\nnot serialize mutations.\" Failure scenario: `SessionMint` begins minting for tenant A; tenant A\nis suspended and the existing hook invalidates A's entries; the in-flight write lands and\nrestores a valid token. Suspended tenant keeps access silently until expiry.\n\n**Remedy (approved):**\n- `AuthBroker` is the **single writer**. `SessionMint` only reads and calls\n  `AuthBroker.mint()` on a miss.\n- Every write carries the **invalidation generation** it observed at read time. The adapter\n  wrapper call in `AuthBroker` compares the generation; a stale write is dropped and logged\n  with tenant ID and reason.\n- The generation counter is bumped by the existing invalidation hooks (logout, revocation,\n  suspension, policy bump). This is one small guard where all writes route through, not a\n  guard in every caller.\n- Test: deterministic interleaving test (read → invalidate → write) proves the write is dropped.\n\n### Issue 2 — In-place rewrite of legacyAuthFlow() with no rollback (decision D6 → 2A)\n`[P1] (confidence: 9/10) PLAN.md:27-28` — \"legacyAuthFlow() will get rewritten.\"\n\n**Remedy (approved):** strangler-fig rollout.\n- Keep `legacyAuthFlow()` callable. A **per-tenant flag** routes each tenant to the legacy or\n  the `AuthBroker` path.\n- Add a counter of requests served by the legacy path (feeds TODO 2's deletion trigger).\n- Migrate tenants in waves. Rollback for one tenant is a flag flip, not a revert.\n- Deletion of the legacy path and the flag is TODO 2, a separate follow-up.\n\n### Issue 3 — No stated goal or invariants (decision D7 → 3A)\n`[P1] (confidence: 9/10) PLAN.md:4-36` — every section describes a smell; none states what\ndone means. Remedy: the Context section above, confirmed by the author before implementation\n(Prerequisite P0).\n\n### Inline ASCII diagrams to add in code\n- `AuthBroker`: the read-generation → mint → write-if-current sequence, with the invalidation\n  hook bumping the generation drawn alongside.\n- `validateAndDispatch()`: the four-step pipeline and the error-boundary mapping table.\n- The flag router: legacy vs new path decision.\n- Interleaving test file: a timeline comment showing which step of which actor runs when.\nDiagram maintenance is part of every later change to these files.\n\n## Code quality (as reviewed)\n\n### Issue 4 — validateAndDispatch() swallows three error classes (decision D8 → 4A)\n`[P1] (confidence: 9/10) PLAN.md:23-24` — \"three nested try/catch blocks; each catch swallows\na different error class.\"\n\n**Remedy (approved):**\n- Flatten into a straight-line pipeline of small steps (parse, verify signature, check tenant\n  policy, dispatch). Each step returns a typed `Result` (reuse ladder: check the repo for an\n  existing Result/Either helper first, then an installed dependency, before adding one).\n- **One error boundary** maps each error class to a distinct outcome, log line and metric.\n  Unknown errors fail closed (reject), never pass.\n- Each step gets its own unit test; the boundary gets one table-driven test per error class.\n- DRY: cache write logic exists in exactly one place (`AuthBroker`, Issue 1). `SessionMint`\n  never duplicates it.\n\n## Tests (as reviewed)\n\n### CRITICAL — Regression: legacyAuthFlow() characterization tests (mandatory, no decision needed)\nPLAN.md:27-28 rewrites existing behavior; PLAN.md:15-16 explicitly excludes it from coverage.\nUnder the regression rule this is a critical requirement:\n- **Before** any rewrite, write characterization tests for `legacyAuthFlow()` covering: valid\n  token, expired token, revoked token, wrong-tenant token, IDP unavailable, logout then replay,\n  tenant suspended then request.\n- Run the same fixtures against the `AuthBroker` path under the flag (D6) and assert parity\n  where behavior must match, and assert the intended difference where it must not.\n- These tests stay until TODO 2 deletes the legacy path, then become new-path-only tests.\n\n### Coverage map (decision D9 → 5A: full map)\n\n```\nCODE PATHS                                                USER FLOWS\n[~] legacyAuthFlow() (kept behind flag)                   [+] Tenant login via new path\n  └── [CRITICAL] characterization: valid / expired          ├── [→E2E] login → mint → validated request\n      / revoked / wrong-tenant / IDP down / logout replay    ├── [→E2E] tenant suspended mid-session → rejected\n[+] AuthBroker (single writer, versioned write)             └──        flag OFF → legacy path, parity\n  ├── write with current generation → stored               [+] Error states (user-visible)\n  ├── write with stale generation → dropped + logged         ├── IDP timeout → explicit, retryable error\n  ├── mint failure (IDP error) → typed error, no write       ├── malformed token → explicit reject\n  └── tenant A key never readable via tenant B key           └── policy miss → explicit reject, never pass\n[+] SessionMint (reads, requests mint)\n  ├── cache hit → no IDP call\n  ├── cache miss → broker mint → stored\n  ├── invalidation during mint → no resurrection (interleaving test)\n  └── two concurrent mints, same tenant/user → one entry, no corruption\n[+] validateAndDispatch() pipeline\n  ├── each step happy path\n  ├── each error class → distinct outcome + log (table test)\n  └── unknown error → fail closed\n[+] IDP validation (parallel)\n  ├── all calls succeed\n  ├── one rejects → others cancelled (assert abort), typed error\n  ├── one hangs → per-call timeout fires\n  ├── discovery/JWKS served from cache within TTL\n  └── unknown kid → JWKS refresh → success (key rotation)\n[+] Flag router\n  ├── flag ON → new path\n  └── flag OFF → legacy path; legacy counter increments\n\nCOVERAGE TODAY: 0/23 paths tested (0%)  |  GAPS: 23 (1 CRITICAL regression, 2 E2E)\nTARGET AT MERGE: 23/23\n```\nLegend: [→E2E] needs integration test. No LLM paths, no evals.\n\n### Test requirements (write alongside the code, not after)\n| # | Test | Kind | Asserts |\n|---|---|---|---|\n| 1 | `legacyAuthFlow` characterization | unit + integration | Existing behavior for 7 fixtures listed above (CRITICAL) |\n| 2 | `AuthBroker` write current generation | unit | Entry stored under full tenant key |\n| 3 | `AuthBroker` write stale generation | unit | Write dropped; log emitted with tenant and reason |\n| 4 | `AuthBroker` mint failure | unit | Typed error returned; adapter untouched |\n| 5 | Cross-tenant isolation | unit | Store under tenant A; read as tenant B returns miss |\n| 6 | `SessionMint` hit / miss | unit | Hit makes zero IDP calls; miss calls broker once |\n| 7 | Invalidation during mint | unit (controlled async) | read → invalidate → write; final state is empty |\n| 8 | Concurrent mints | unit | One stored entry; both callers get a valid result or a clean error |\n| 9 | Pipeline steps | unit | Each step's Result on valid and invalid input |\n| 10 | Error boundary | table-driven unit | Each error class → its outcome, log, metric; unknown → reject |\n| 11 | IDP all succeed | unit (stubbed IDP) | Result assembled; call count = expected |\n| 12 | IDP one rejects | unit | Other calls' AbortSignal aborted; typed error |\n| 13 | IDP one hangs | unit (fake timers) | Timeout error within the bound |\n| 14 | Discovery/JWKS cache | unit | Second validation makes no discovery/JWKS call |\n| 15 | Unknown kid rotation | unit | Refresh once, then verify succeeds |\n| 16 | Flag routing | unit | ON → new path; OFF → legacy path + counter |\n| 17 | Login → validated request | E2E | Full flow succeeds; second request is a cache hit |\n| 18 | Suspend mid-session | E2E | Next request rejected; no token resurrection |\n\nTest framework: none detected in this fixture repo (no `package.json`, zero test files). Match\nthe real repo's existing convention (`*.test.ts` or `*.spec.ts`) when implementing.\n\n## Performance (as reviewed)\n\n### Issue 6 — Bare Promise.all over 5 IDP calls (decision D10 → 6A)\n`[P2] (confidence: 7/10) PLAN.md:31-32` — \"parallelized via Promise.all trivially.\"\nPromise.all is fail-fast but does not cancel: the first rejection leaves four calls running\nagainst an already-degraded IDP. 1→5 concurrent calls per request multiplies burst against\nrate-limited per-tenant IDPs.\n\n**Remedy (approved):**\n- Run the independent calls with `Promise.all`, all sharing one `AbortController` signal;\n  the first rejection aborts the rest.\n- Each call gets `AbortSignal.timeout(...)` combined with the shared signal, so a hung IDP\n  bounds the tail.\n- **Cache the discovery document (TTL hours) and JWKS (TTL minutes)** per issuer; on an\n  unknown `kid`, refresh once and retry the verification. Hot path drops to 3 or fewer network\n  calls. **[Layer 1]** — standard OIDC practice, no new dependency needed.\n- Memory: the discovery/JWKS cache is bounded by issuer count, not request count.\n\nNo N+1 or database access patterns in scope.\n\n## What already exists\n| Existing piece | Plan's use | Verdict |\n|---|---|---|\n| Tenant-keyed cache adapter with eviction and invalidation hooks + tests | Reused unchanged, injected | Correct reuse |\n| `legacyAuthFlow()` | Was to be rewritten in place | Now kept behind a flag with characterization tests until TODO 2 |\n| Module cache singleton semantics | Was relied on via module-level export | Replaced by constructor injection; the global bought nothing |\n| `AuthCache` facade (proposed) | Wrapped the adapter | Dropped as duplicate |\n\n## NOT in scope\n- `RequestPolicy` — no consumer named; deferred to TODO 1.\n- `TokenStore` and `AuthCache` — dropped; the adapter already does this job.\n- Changing the adapter's key schema or serializing mutations inside the adapter — the\n  generation check in `AuthBroker` closes the race without touching the adapter contract.\n- Deleting `legacyAuthFlow()` and the flag — TODO 2, after all tenants migrate.\n- Module-wide audit of swallow-and-continue catch blocks — TODO 3, separate diff.\n- IDP-side changes, multi-region cache, new artifacts or distribution — none introduced.\n\n## Failure modes\n| New codepath | Realistic failure | Test | Handling | User sees |\n|---|---|---|---|---|\n| `AuthBroker` write | Stale write after invalidation | #7 | Generation check drops + logs | Rejected on next request, log for on-call |\n| `AuthBroker` mint | IDP 5xx | #4, #12 | Typed error via boundary | Clear retryable error |\n| `SessionMint` read | Wrong tenant key | #5 | Adapter key includes tenant ID | Miss, then mint for own tenant |\n| Pipeline boundary | Unmapped error class | #10 | Fail closed | Explicit reject |\n| IDP parallel | One call hangs | #13 | Per-call timeout | Timeout error, no spinner |\n| JWKS cache | Key rotation | #15 | Refresh on unknown kid | Transparent |\n| Flag router | Flag store unavailable | #16 (add case) | Default to legacy path, log | No change in behavior |\n| Legacy path | Behavior drift during refactor | #1 (CRITICAL) | Parity assertions | None if tests hold |\n\n**Critical gaps: 0.** The stale-write resurrection race would have been a critical gap (no\ntest, no handling, silent) under the original plan; decision D5 closes it with test #7.\nFlag-store unavailability is added to test #16 as a case.\n\n## Worktree parallelization strategy\n\n| Step | Modules touched | Depends on |\n|---|---|---|\n| S0 Author confirms Context (P0) | PLAN.md | — |\n| S1 Characterization tests for legacy path | auth/__tests__ | S0 |\n| S2 `AuthBroker` + `SessionMint` + generation check | auth/ (broker, mint) | S0 |\n| S3 `validateAndDispatch()` pipeline + boundary | auth/ (validate) | S0 |\n| S4 IDP parallel calls + discovery/JWKS cache | auth/idp | S0 |\n| S5 Flag router + legacy counter | auth/ (routing), config/ | S1, S2 |\n| S6 Interleaving, isolation, concurrency tests | auth/__tests__ | S2 |\n| S7 E2E flows | e2e/ | S2, S3, S4, S5 |\n\nLanes:\n- Lane A: S1 (independent, test-only, must land before any rewrite)\n- Lane B: S2 → S6 (sequential, shared broker/mint module)\n- Lane C: S3 (independent)\n- Lane D: S4 (independent)\n- Lane E: S5 → S7 (after A, B, C, D merge)\n\nExecution: after S0, launch A + B + C + D in parallel worktrees. Merge all four. Then E.\nConflict flag: Lanes B and C both live under `auth/`; keep them in separate files (broker/mint\nvs validate) and expect a small import-level merge in the module index.\n\n## TODOs (approved; write to TODOS.md when plan mode exits)\n\n### RequestPolicy seam (D11)\n**What:** Introduce a `RequestPolicy` type once a concrete consumer needs per-request policy\ndecisions beyond the adapter's policy-version key.\n**Why:** Dropped from scope because no plan section names a caller; keeps the author's intent.\n**Context:** PLAN.md listed it with no description. After the refactor lands, grep call sites\nthat branch on tenant policy; 2+ sites is the consumer.\n**Effort:** M **Priority:** P3 **Depends on:** Refactor merged.\n\n### Delete legacyAuthFlow() and the per-tenant flag (D12)\n**What:** Remove the legacy path, the routing flag, and the parity assertions once every tenant\nis on the `AuthBroker` path.\n**Why:** A strangler without scheduled demolition is two auth code paths forever.\n**Context:** Watch the legacy-path counter added in S5; when it reads zero for a full cycle,\ndelete. Characterization tests become new-path-only tests.\n**Effort:** S **Priority:** P2 **Depends on:** All tenants flagged onto the new path.\n\n### Audit auth module for swallow-and-continue catch blocks (D13)\n**What:** Find catch blocks that neither rethrow, return an explicit failure, nor log, and route\nthem through the D8 error boundary.\n**Why:** `validateAndDispatch()` is unlikely to be the only site; same silent-failure class.\n**Context:** Grep `catch` in the auth directory for bodies with no throw/return-error/log.\n**Effort:** M **Priority:** P2 **Depends on:** D8 pipeline merged.\n\n## Implementation Tasks\nSynthesized from this review's findings. Each task derives from a specific finding above.\nRun with Claude Code or Codex; checkbox as you ship.\n\n- [ ] **T1 (P1, human: ~1 day / CC: ~20 min)** — auth/legacy — Write characterization tests for `legacyAuthFlow()` before any rewrite\n  - Surfaced by: Test review, REGRESSION RULE — PLAN.md:27-28, PLAN.md:15-16\n  - Files: auth/__tests__/ (match repo convention)\n  - Verify: tests pass against the current legacy path; fixtures cover the 7 listed cases\n- [ ] **T2 (P1, human: ~30 min / CC: ~5 min)** — plan — Author confirms goal, latency target and two invariants in Context\n  - Surfaced by: Architecture issue 3 (D7)\n  - Files: this plan's Context section\n  - Verify: Context has no \"(draft)\" markers left\n- [ ] **T3 (P1, human: ~1 day / CC: ~20 min)** — auth/broker — `AuthBroker` sole writer with invalidation-generation check; `SessionMint` reads; adapter constructor-injected\n  - Surfaced by: Architecture issue 1 (D5) — PLAN.md:19-20, :10\n  - Files: auth/ (broker, mint), existing invalidation hooks bump the generation\n  - Verify: tests #2-#8\n- [ ] **T4 (P1, human: ~1 day / CC: ~15 min)** — auth/routing — Per-tenant flag between legacy and new path, plus legacy-path counter\n  - Surfaced by: Architecture issue 2 (D6)\n  - Files: auth/ (routing), config/\n  - Verify: test #16 incl. flag-store-unavailable → legacy\n- [ ] **T5 (P1, human: ~1 day / CC: ~20 min)** — auth/validate — Flatten `validateAndDispatch()` into typed pipeline + one error boundary\n  - Surfaced by: Code quality issue 4 (D8) — PLAN.md:23-24\n  - Files: auth/ (validate); reuse an existing Result helper if one exists\n  - Verify: tests #9-#10\n- [ ] **T6 (P1, human: ~3 days / CC: ~45 min)** — auth/tests — Full test map: race, isolation, concurrency, IDP failure modes, 2 E2E\n  - Surfaced by: Test review issue 5 (D9)\n  - Files: auth/__tests__/, e2e/\n  - Verify: coverage map reads 23/23\n- [ ] **T7 (P2, human: ~1.5 days / CC: ~25 min)** — auth/idp — Parallel IDP calls with shared abort + per-call timeout; cache discovery + JWKS with unknown-kid refresh\n  - Surfaced by: Performance issue 6 (D10) — PLAN.md:31-32\n  - Files: auth/idp/\n  - Verify: tests #11-#15; hot path makes ≤3 network calls\n- [ ] **T8 (P3, human: ~15 min / CC: ~3 min)** — docs — Create TODOS.md with the three approved entries\n  - Surfaced by: TODOS.md updates (D11-D13)\n  - Files: TODOS.md\n  - Verify: file exists with three H3 entries in the TODOS-format shape\n\n## Suppressed findings\n- `[P3] (confidence: 5/10) PLAN.md:7-9` — Cache keys omit the IDP client ID; if a tenant runs two\n  clients against one issuer/audience, entries could collide. Medium confidence, verify this\n  is actually an issue against the real adapter key before acting. No code was available to\n  quote, so this stays in the appendix.\n\n## Review completion summary\n- Step 0: Scope Challenge — scope reduced per recommendation (5 types/12 files → 2 types/~7 files)\n- Architecture Review: 3 issues found (all resolved: 1A, 2A, 3A)\n- Code Quality Review: 1 issue found (resolved: 4A)\n- Test Review: diagram produced, 23 gaps identified (1 CRITICAL regression added by rule; rest resolved: 5A)\n- Performance Review: 1 issue found (resolved: 6A)\n- NOT in scope: written\n- What already exists: written\n- TODOS.md updates: 3 items proposed to user, 3 accepted\n- Failure modes: 0 critical gaps remaining (1 would-be critical gap closed by D5)\n- Outside voice: skipped (codex_reviews disabled)\n- Parallelization: 5 lanes, 4 parallel / 1 sequential after merge\n- Lake Score: 6/6 recommendations chose the complete option\n\n## GSTACK REVIEW REPORT\n\n| Review | Trigger | Why | Runs | Status | Findings |\n|--------|---------|-----|------|--------|----------|\n| CEO Review | `/plan-ceo-review` | Scope & strategy | 0 | — | — |\n| Outside Review | codex via `/plan-eng-review` (disabled) | Independent 2nd opinion | 1 | disabled | 0 (skipped, host=claude, provider=codex, phase=plan-review) |\n| Eng Review | `/plan-eng-review` | Architecture & tests (required) | 1 | clean (PLAN) | 24 issues, 0 critical gaps, mode SCOPE_REDUCED |\n| Design Review | `/plan-design-review` | UI/UX gaps | 0 | — | — |\n| DX Review | `/plan-devex-review` | Developer experience gaps | 0 | — | — |\n\n**OUTSIDE COVERAGE:** provider codex, phase plan-review, outside_status disabled (user opt-out via `codex_reviews=disabled`); no native fallback dispatched; 0 findings. Outside coverage is absent, not clean.\n\n**VERDICT:** ENG CLEARED — ready to implement once Prerequisite P0 (author confirms Context) is done. Outside review disabled by config.\n\nNO UNRESOLVED DECISIONS\n",
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        "toolUseId": "toolu_01PB4xuaMCGz1CRsiJYoirn5",
        "questions": [
          {
            "question": "D1 — Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, about to run /plan-eng-review on PLAN.md.\nELI10: gstack works best when your project's CLAUDE.md includes skill routing rules, so that requests like \"review the architecture\" or \"ship this\" automatically route to the right skill instead of you naming it each time. This is a one-time setup prompt per project. Note: we are in plan mode right now, so if you pick A I will record the choice and append/commit the section only after plan mode exits.\nStakes if we pick wrong: Without routing, skills only fire when you name them explicitly; with routing, nothing breaks, you just get one extra section in CLAUDE.md.\nRecommendation: A because routing rules make the skill suite self-serve and cost one small commit.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a small CLAUDE.md append versus invoking skills by name forever.",
            "header": "Routing",
            "multiSelect": false,
            "options": [
              {
                "label": "Add routing rules (recommended)",
                "description": "✅ Requests auto-route to the matching skill without naming it each time. ✅ One short section appended to CLAUDE.md, committed once (human: ~2 min / CC: ~10 sec). ❌ Adds a gstack-specific block to a project file teammates also read."
              },
              {
                "label": "No thanks, invoke manually",
                "description": "✅ CLAUDE.md stays exactly as it is today, nothing extra committed. ✅ You keep full explicit control over when skills run. ❌ You must type the /skill name every time, and this prompt will not re-offer."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D1 — Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, about to run /plan-eng-review on PLAN.md.\nELI10: gstack works best when your project's CLAUDE.md includes skill routing rules, so that requests like \"review the architecture\" or \"ship this\" automatically route to the right skill instead of you naming it each time. This is a one-time setup prompt per project. Note: we are in plan mode right now, so if you pick A I will record the choice and append/commit the section only after plan mode exits.\nStakes if we pick wrong: Without routing, skills only fire when you name them explicitly; with routing, nothing breaks, you just get one extra section in CLAUDE.md.\nRecommendation: A because routing rules make the skill suite self-serve and cost one small commit.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a small CLAUDE.md append versus invoking skills by name forever.": "Add routing rules (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:18:59.984Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_01DCxScs8A4buRspLArYkfSR",
        "questions": [
          {
            "question": "D2 — Run /office-hours first, or proceed with the standard review?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, reviewing PLAN.md (Multi-tenant Auth Refactor).\nELI10: No design doc found for this branch. /office-hours produces a structured problem statement, premise challenge, and explored alternatives, which gives this review sharper input. It takes about 10 minutes. The design doc is per-feature, not per-product. PLAN.md today reads as a list of known smells with no stated goal, so the problem statement is genuinely missing.\nStakes if we pick wrong: Skipping means the review must infer the goal from the smells and flag the missing problem statement as a finding; running it delays the requested review deliverable by a full extra workflow.\nRecommendation: B because you asked for the reviewed plan deliverable now, and the missing goal statement is better captured as an explicit finding in this review than by detouring.\nNote: options differ in kind, not coverage — no completeness score.\nNet: sharper input versus the deliverable you asked for, sooner.",
            "header": "Prereq",
            "multiSelect": false,
            "options": [
              {
                "label": "Skip, standard review (recommended)",
                "description": "✅ Delivers the reviewed plan now, as requested, with the missing goal flagged as a finding. ✅ No extra workflow or context spent before the review starts (human: 0 / CC: 0). ❌ The review infers the refactor's goal from the listed smells rather than a stated problem."
              },
              {
                "label": "Run /office-hours now",
                "description": "✅ Produces a real problem statement and alternatives before architecture gets locked in. ✅ The review then grounds every recommendation in a stated goal (human: ~10 min / CC: ~10 min). ❌ Delays the requested deliverable and adds a second interactive workflow to this session."
              }
            ]
          },
          {
            "question": "D3 — Enable cross-project learnings search?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, one-time gstack setting.\nELI10: gstack can search learnings from your other projects on this machine to find patterns that might apply here. This stays local, no data leaves your machine. Recommended for solo developers. Skip if you work on multiple client codebases where cross-contamination would be a concern.\nStakes if we pick wrong: Enabling on a multi-client machine could surface one client's patterns while reviewing another's; disabling loses reuse of pitfalls you already paid for elsewhere.\nRecommendation: A because it is local-only and the learnings store is currently empty here, so the only upside comes from other projects.\nNote: options differ in kind, not coverage — no completeness score.\nNet: reuse of past lessons versus strict per-project isolation.",
            "header": "Learnings",
            "multiSelect": false,
            "options": [
              {
                "label": "Enable cross-project (recommended)",
                "description": "✅ Past pitfalls and patterns from your other repos inform this and future reviews. ✅ Entirely local; one config flag you can flip back any time. ❌ On a shared or multi-client machine, learnings from unrelated codebases can leak into recommendations."
              },
              {
                "label": "Project-scoped only",
                "description": "✅ Guarantees no cross-codebase contamination of review advice. ✅ Simplest mental model: what this repo taught gstack stays with this repo. ❌ This repo has zero learnings today, so the search adds nothing until the store grows."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D2 — Run /office-hours first, or proceed with the standard review?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, reviewing PLAN.md (Multi-tenant Auth Refactor).\nELI10: No design doc found for this branch. /office-hours produces a structured problem statement, premise challenge, and explored alternatives, which gives this review sharper input. It takes about 10 minutes. The design doc is per-feature, not per-product. PLAN.md today reads as a list of known smells with no stated goal, so the problem statement is genuinely missing.\nStakes if we pick wrong: Skipping means the review must infer the goal from the smells and flag the missing problem statement as a finding; running it delays the requested review deliverable by a full extra workflow.\nRecommendation: B because you asked for the reviewed plan deliverable now, and the missing goal statement is better captured as an explicit finding in this review than by detouring.\nNote: options differ in kind, not coverage — no completeness score.\nNet: sharper input versus the deliverable you asked for, sooner.": "Skip, standard review (recommended)",
          "D3 — Enable cross-project learnings search?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, one-time gstack setting.\nELI10: gstack can search learnings from your other projects on this machine to find patterns that might apply here. This stays local, no data leaves your machine. Recommended for solo developers. Skip if you work on multiple client codebases where cross-contamination would be a concern.\nStakes if we pick wrong: Enabling on a multi-client machine could surface one client's patterns while reviewing another's; disabling loses reuse of pitfalls you already paid for elsewhere.\nRecommendation: A because it is local-only and the learnings store is currently empty here, so the only upside comes from other projects.\nNote: options differ in kind, not coverage — no completeness score.\nNet: reuse of past lessons versus strict per-project isolation.": "Enable cross-project (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:20:58.274Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_01TKTdk9cTrnYbRqZeLaqaUd",
        "questions": [
          {
            "question": "D4 — Scope: 12 files and 5 new types for the auth refactor. Reduce, or proceed as-is?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md lines 19-20 and 35-36.\nELI10: The plan adds AuthBroker, SessionMint, TokenStore, AuthCache and RequestPolicy. But PLAN.md:11-13 says AuthCache is just a facade over the existing adapter with one backing cache and the adapter stays unchanged, so AuthCache is a second name for something you already have. TokenStore overlaps the adapter's token storage job, and RequestPolicy has no stated consumer anywhere in the plan. Every extra type is another place a 3am on-call engineer has to look when auth breaks.\nStakes if we pick wrong: Over-scoped, you ship a 12-file auth change with two layers doing one job and a harder rollback. Under-scoped, a real seam (say, RequestPolicy) gets cut and gets bolted on later in a worse spot.\nRecommendation: A because the existing adapter already owns tenant keys, eviction and invalidation, so handing it to AuthBroker and SessionMint by constructor injection achieves the goal with two new types and roughly 7 files.\nNote: options differ in kind, not coverage — no completeness score.\nNet: two focused services on the proven adapter versus five types that split one cache across two layers.",
            "header": "Scope",
            "multiSelect": false,
            "options": [
              {
                "label": "A) Reduce to 2 new types (recommended)",
                "description": "✅ AuthBroker and SessionMint take the existing adapter via constructor; AuthCache and TokenStore dropped, RequestPolicy deferred until a consumer exists (human: ~3 days / CC: ~1 hr). ✅ Fewer files in the auth diff means a smaller blast radius and an easier revert. ❌ If RequestPolicy turns out to be load-bearing, it lands as a follow-up rather than in this design pass."
              },
              {
                "label": "B) Proceed as-is, 5 types / 12 files",
                "description": "✅ Every seam the author envisioned is present from day one; no follow-up structural PR. ✅ No re-planning cost right now (human: ~1 week / CC: ~2 hr). ❌ Two cache layers (adapter + AuthCache) over one backing store, plus two types with no stated job, in an auth path."
              },
              {
                "label": "C) Drop AuthCache only, keep TokenStore + RequestPolicy",
                "description": "✅ Removes the clearest duplicate while keeping the author's other seams intact. ✅ Moderate diff, roughly 9-10 files (human: ~4 days / CC: ~1.5 hr). ❌ TokenStore still overlaps the adapter's storage role, and RequestPolicy still has no consumer in the plan."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D4 — Scope: 12 files and 5 new types for the auth refactor. Reduce, or proceed as-is?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md lines 19-20 and 35-36.\nELI10: The plan adds AuthBroker, SessionMint, TokenStore, AuthCache and RequestPolicy. But PLAN.md:11-13 says AuthCache is just a facade over the existing adapter with one backing cache and the adapter stays unchanged, so AuthCache is a second name for something you already have. TokenStore overlaps the adapter's token storage job, and RequestPolicy has no stated consumer anywhere in the plan. Every extra type is another place a 3am on-call engineer has to look when auth breaks.\nStakes if we pick wrong: Over-scoped, you ship a 12-file auth change with two layers doing one job and a harder rollback. Under-scoped, a real seam (say, RequestPolicy) gets cut and gets bolted on later in a worse spot.\nRecommendation: A because the existing adapter already owns tenant keys, eviction and invalidation, so handing it to AuthBroker and SessionMint by constructor injection achieves the goal with two new types and roughly 7 files.\nNote: options differ in kind, not coverage — no completeness score.\nNet: two focused services on the proven adapter versus five types that split one cache across two layers.": "A) Reduce to 2 new types (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:22:14.017Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_01MaBGFFWUhpt2tpUYCffX3Z",
        "questions": [
          {
            "question": "D5 — Issue 1: AuthBroker and SessionMint both mutate one shared cache with no ordering guard. Who owns writes?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:19-20 (\"share a global mutable AuthCache ... Both services mutate it\") and PLAN.md:10 (\"they do not serialize mutations\").\nELI10: Two services writing the same tenant-keyed cache with nothing ordering them is a race. Realistic failure: SessionMint starts minting a session for tenant A, the tenant gets suspended and the existing hook invalidates A's entries, then SessionMint's in-flight write lands and puts a fresh token back. A suspended tenant keeps working until the token expires, silently. The existing adapter guarantees validity and tenant keys, but PLAN.md:10 says outright that it does not serialize mutations, so nothing today prevents this. Even with constructor injection (D4), two writers still race.\nStakes if we pick wrong: Revoked or suspended tenants can resurrect access with no error and no log line; that is a security incident, not a bug.\nRecommendation: A because a single writer plus a version check on write is explicit, testable, and costs one small guard where all writes route through, which matches your explicit-over-clever and root-cause preferences.\nCompleteness: A=10/10, B=6/10, C=3/10\nNet: one guarded write path versus two unguarded writers that only fail under the timing you never see in tests.",
            "header": "Arch 1",
            "multiSelect": false,
            "options": [
              {
                "label": "1A) Single writer + versioned write (recommended)",
                "description": "✅ AuthBroker is the only component that writes tokens; SessionMint reads and asks the broker to mint. Writes carry the invalidation generation they read, and a write with a stale generation is dropped and logged (human: ~1 day / CC: ~20 min). ✅ Testable deterministically: one interleaving test proves a suspended tenant cannot resurrect a token. ❌ Adds a generation counter to the adapter wrapper call path and one more concept to explain."
              },
              {
                "label": "1B) Inject the adapter into both, both still write",
                "description": "✅ Removes the module-level global, so tests can pass a fake adapter (human: ~2 hr / CC: ~5 min). ✅ Smallest diff on top of the D4 scope reduction. ❌ The invalidate-then-stale-write race stays; only the failure's discoverability improves."
              },
              {
                "label": "1C) Keep the module-level export as planned",
                "description": "✅ Zero additional work beyond what PLAN.md already describes. ✅ Matches the module-cache singleton idiom some TypeScript codebases already use. ❌ Hidden global coupling, untestable without module mocking, and the resurrection race ships unaddressed."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D5 — Issue 1: AuthBroker and SessionMint both mutate one shared cache with no ordering guard. Who owns writes?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:19-20 (\"share a global mutable AuthCache ... Both services mutate it\") and PLAN.md:10 (\"they do not serialize mutations\").\nELI10: Two services writing the same tenant-keyed cache with nothing ordering them is a race. Realistic failure: SessionMint starts minting a session for tenant A, the tenant gets suspended and the existing hook invalidates A's entries, then SessionMint's in-flight write lands and puts a fresh token back. A suspended tenant keeps working until the token expires, silently. The existing adapter guarantees validity and tenant keys, but PLAN.md:10 says outright that it does not serialize mutations, so nothing today prevents this. Even with constructor injection (D4), two writers still race.\nStakes if we pick wrong: Revoked or suspended tenants can resurrect access with no error and no log line; that is a security incident, not a bug.\nRecommendation: A because a single writer plus a version check on write is explicit, testable, and costs one small guard where all writes route through, which matches your explicit-over-clever and root-cause preferences.\nCompleteness: A=10/10, B=6/10, C=3/10\nNet: one guarded write path versus two unguarded writers that only fail under the timing you never see in tests.": "1A) Single writer + versioned write (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:22:50.133Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_01FpJ6XEt4Yh3nyovGp5qWts",
        "questions": [
          {
            "question": "D6 — Issue 2: legacyAuthFlow() is rewritten in place with no way to roll back. Gate the new path behind a flag?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:27-28 (\"legacyAuthFlow() will get rewritten as part of this work\").\nELI10: The plan replaces the existing login path outright. If the new AuthBroker path has a bug for one tenant's IDP quirk, the only fix is a revert of the whole 7-file change while users are locked out. A strangler-fig rollout keeps legacyAuthFlow() callable, routes traffic by a per-tenant flag, and lets you move tenants over in waves, then delete the old path in a follow-up commit once every tenant is on the new one.\nStakes if we pick wrong: Without a flag, the first production auth regression is a full revert under lockout pressure; with one, it is a flag flip for one tenant.\nRecommendation: A because auth is the one path where reversibility is worth a temporary second branch, and the deletion is a trivial follow-up once tenants are migrated.\nCompleteness: A=10/10, B=7/10, C=3/10\nNet: a short-lived flag and one extra branch versus a big-bang cutover on the login path.",
            "header": "Arch 2",
            "multiSelect": false,
            "options": [
              {
                "label": "2A) Per-tenant flag, strangler rollout (recommended)",
                "description": "✅ New path enabled per tenant; any regression is a flag flip, not a revert (human: ~1 day / CC: ~15 min). ✅ Old and new paths run side by side, so the characterization tests can assert parity on the same inputs. ❌ Two live code paths until the cleanup commit deletes legacyAuthFlow()."
              },
              {
                "label": "2B) Global on/off flag only",
                "description": "✅ Still a one-line rollback instead of a revert (human: ~2 hr / CC: ~5 min). ✅ Less flag plumbing than per-tenant routing. ❌ A problem for one tenant's IDP forces every tenant back to the old path."
              },
              {
                "label": "2C) Rewrite in place, no flag",
                "description": "✅ Smallest diff and no temporary dual path to maintain. ✅ Nothing to clean up afterwards. ❌ Rollback is a full revert under active lockout, on the auth path."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D6 — Issue 2: legacyAuthFlow() is rewritten in place with no way to roll back. Gate the new path behind a flag?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:27-28 (\"legacyAuthFlow() will get rewritten as part of this work\").\nELI10: The plan replaces the existing login path outright. If the new AuthBroker path has a bug for one tenant's IDP quirk, the only fix is a revert of the whole 7-file change while users are locked out. A strangler-fig rollout keeps legacyAuthFlow() callable, routes traffic by a per-tenant flag, and lets you move tenants over in waves, then delete the old path in a follow-up commit once every tenant is on the new one.\nStakes if we pick wrong: Without a flag, the first production auth regression is a full revert under lockout pressure; with one, it is a flag flip for one tenant.\nRecommendation: A because auth is the one path where reversibility is worth a temporary second branch, and the deletion is a trivial follow-up once tenants are migrated.\nCompleteness: A=10/10, B=7/10, C=3/10\nNet: a short-lived flag and one extra branch versus a big-bang cutover on the login path.": "2A) Per-tenant flag, strangler rollout (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:23:08.211Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_0147cpYN9qq37APE6SWMwcUX",
        "questions": [
          {
            "question": "D7 — Issue 3: PLAN.md never states the refactor's goal or its invariants. Require them before implementation?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:4-36 (every section describes a smell; none states what users or operators gain).\nELI10: The plan says what is wrong with the code but not what \"done\" means: which tenant-isolation guarantees must hold, which latency target token validation must hit, and what the multi-tenant change unlocks. Without that, every implementer picks their own definition, and the tests in Section 3 have nothing to assert against beyond \"it runs.\" The reviewed plan will carry a Context section with the goal I can infer and two invariants (no cross-tenant reads, no token resurrection after revocation), but the author must confirm or correct them.\nStakes if we pick wrong: Code that passes its own tests but solves a different problem than the one that prompted the refactor.\nRecommendation: A because writing three sentences now is far cheaper than discovering the goal mismatch in review of a 7-file auth diff, matching your thoughtfulness-over-speed preference.\nCompleteness: A=10/10, B=6/10\nNet: a short, explicit definition of done versus an inferred one that nobody signed off on.",
            "header": "Arch 3",
            "multiSelect": false,
            "options": [
              {
                "label": "3A) Author confirms goal + invariants first (recommended)",
                "description": "✅ Implementation starts from a stated goal, a latency target, and two named security invariants that tests assert directly (human: ~30 min / CC: ~5 min to draft). ✅ The reviewed plan ships with the inferred draft filled in, so confirming is a read-and-edit, not a blank page. ❌ Implementation is blocked until someone with product context confirms the draft."
              },
              {
                "label": "3B) Proceed on the inferred goal",
                "description": "✅ No blocking step; the review's inferred Context section stands as written. ✅ Fine if the author is you and the inference matches your intent. ❌ If the inference is wrong, tests and architecture were tuned to the wrong target."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D7 — Issue 3: PLAN.md never states the refactor's goal or its invariants. Require them before implementation?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:4-36 (every section describes a smell; none states what users or operators gain).\nELI10: The plan says what is wrong with the code but not what \"done\" means: which tenant-isolation guarantees must hold, which latency target token validation must hit, and what the multi-tenant change unlocks. Without that, every implementer picks their own definition, and the tests in Section 3 have nothing to assert against beyond \"it runs.\" The reviewed plan will carry a Context section with the goal I can infer and two invariants (no cross-tenant reads, no token resurrection after revocation), but the author must confirm or correct them.\nStakes if we pick wrong: Code that passes its own tests but solves a different problem than the one that prompted the refactor.\nRecommendation: A because writing three sentences now is far cheaper than discovering the goal mismatch in review of a 7-file auth diff, matching your thoughtfulness-over-speed preference.\nCompleteness: A=10/10, B=6/10\nNet: a short, explicit definition of done versus an inferred one that nobody signed off on.": "3A) Author confirms goal + invariants first (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:23:26.274Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_01AYqEFiSbnVFUrhPY3WGjA8",
        "questions": [
          {
            "question": "D8 — Issue 4: validateAndDispatch() is 60 lines with three nested try/catch blocks that each swallow an error class. Flatten it?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:23-24 (\"three nested try/catch blocks; each catch swallows a different error class\").\nELI10: A swallowed error means the function keeps going as if nothing happened. In an auth path, that is how an IDP timeout, a malformed token, and a policy lookup miss all turn into the same silent \"validation passed\" or \"validation failed\" with no log, no metric and no way for on-call to tell them apart at 3am. The fix is a straight-line pipeline of small steps, each returning a typed result, with one boundary that maps each error class to an explicit outcome and a log line.\nStakes if we pick wrong: Production auth failures stay invisible; the first signal is a customer ticket rather than an alert.\nRecommendation: A because a typed pipeline with a single error boundary is explicit over clever, each step gets its own unit test, and the diff is the same size as fixing the swallows in place.\nCompleteness: A=10/10, B=7/10, C=2/10\nNet: three observable, testable failure modes versus three invisible ones.",
            "header": "Code 4",
            "multiSelect": false,
            "options": [
              {
                "label": "4A) Typed step pipeline + one error boundary (recommended)",
                "description": "✅ Steps (parse, verify signature, check tenant policy, dispatch) each return a typed Result; one boundary maps every error class to a distinct outcome, log line and metric (human: ~1 day / CC: ~20 min). ✅ Each step is unit-testable in isolation; the error boundary gets one table-driven test per class. ❌ Introduces a small Result type or reuses one already in the repo; implementer must check the reuse ladder first."
              },
              {
                "label": "4B) Keep the structure, stop swallowing",
                "description": "✅ Minimal diff: each catch now rethrows a typed error or returns an explicit failure (human: ~2 hr / CC: ~5 min). ✅ Errors become visible and loggable without restructuring. ❌ Three nested blocks stay, so the 60-line function remains hard to test branch by branch."
              },
              {
                "label": "4C) Leave as-is",
                "description": "✅ No change, no risk of altering current behavior. ✅ Zero effort. ❌ Silent failures on the auth path ship into the refactor untouched."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D8 — Issue 4: validateAndDispatch() is 60 lines with three nested try/catch blocks that each swallow an error class. Flatten it?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:23-24 (\"three nested try/catch blocks; each catch swallows a different error class\").\nELI10: A swallowed error means the function keeps going as if nothing happened. In an auth path, that is how an IDP timeout, a malformed token, and a policy lookup miss all turn into the same silent \"validation passed\" or \"validation failed\" with no log, no metric and no way for on-call to tell them apart at 3am. The fix is a straight-line pipeline of small steps, each returning a typed result, with one boundary that maps each error class to an explicit outcome and a log line.\nStakes if we pick wrong: Production auth failures stay invisible; the first signal is a customer ticket rather than an alert.\nRecommendation: A because a typed pipeline with a single error boundary is explicit over clever, each step gets its own unit test, and the diff is the same size as fixing the swallows in place.\nCompleteness: A=10/10, B=7/10, C=2/10\nNet: three observable, testable failure modes versus three invisible ones.": "4A) Typed step pipeline + one error boundary (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:23:48.343Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_01J1JWDEDDrabRKK9YwUNauA",
        "questions": [
          {
            "question": "D9 — Issue 5: PLAN.md:14-15 promises success/error coverage for new components only. How far does test coverage go?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:14-16 (\"coverage is planned for the new components and their success/error paths\").\nELI10: The legacyAuthFlow() characterization tests are already mandatory under the regression rule and are not part of this question. What is open is the rest of the map above: the invalidation-during-mint race, the tenant-isolation check (tenant A's token never visible through tenant B's key), IDP partial failure and timeout, the error-boundary table, and the two end-to-end flows (login through a validated request, and tenant suspended mid-session). These are the tests that prove the two security invariants from D7, and unit tests alone cannot show the suspended-tenant flow works across broker, cache and hooks.\nStakes if we pick wrong: The two invariants that justify the refactor ship unproven; the race in D5 is exactly the kind of bug that only a deliberate interleaving test ever catches.\nRecommendation: A because with CC the full set costs minutes, not days, and you have said you would rather have too many tests than too few.\nCompleteness: A=10/10, B=7/10, C=4/10\nNet: every branch and both invariants asserted versus happy-path confidence on an auth path.",
            "header": "Tests 5",
            "multiSelect": false,
            "options": [
              {
                "label": "5A) Full map: units + race + isolation + 2 E2E (recommended)",
                "description": "✅ All 18 non-regression gaps covered, including a deterministic interleaving test for the stale-write race and a cross-tenant isolation test (human: ~3 days / CC: ~45 min). ✅ Two E2E flows prove the invariants end to end where mocking would hide hook wiring mistakes. ❌ The interleaving test needs controllable async ordering in the fake adapter; slightly more test scaffolding."
              },
              {
                "label": "5B) Units + race + isolation, no E2E",
                "description": "✅ Every unit branch and both invariant tests land at the unit level (human: ~2 days / CC: ~30 min). ✅ No E2E harness or IDP stub to stand up. ❌ Hook wiring between adapter, broker and suspension path is only proven by mocks, which is where real failures hide."
              },
              {
                "label": "5C) Success/error paths as the plan states",
                "description": "✅ Matches PLAN.md as written, no added test scope. ✅ Fastest to land (human: ~1 day / CC: ~15 min). ❌ The race, tenant isolation, IDP timeout and both E2E flows stay untested; the invariants are asserted nowhere."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D9 — Issue 5: PLAN.md:14-15 promises success/error coverage for new components only. How far does test coverage go?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:14-16 (\"coverage is planned for the new components and their success/error paths\").\nELI10: The legacyAuthFlow() characterization tests are already mandatory under the regression rule and are not part of this question. What is open is the rest of the map above: the invalidation-during-mint race, the tenant-isolation check (tenant A's token never visible through tenant B's key), IDP partial failure and timeout, the error-boundary table, and the two end-to-end flows (login through a validated request, and tenant suspended mid-session). These are the tests that prove the two security invariants from D7, and unit tests alone cannot show the suspended-tenant flow works across broker, cache and hooks.\nStakes if we pick wrong: The two invariants that justify the refactor ship unproven; the race in D5 is exactly the kind of bug that only a deliberate interleaving test ever catches.\nRecommendation: A because with CC the full set costs minutes, not days, and you have said you would rather have too many tests than too few.\nCompleteness: A=10/10, B=7/10, C=4/10\nNet: every branch and both invariants asserted versus happy-path confidence on an auth path.": "5A) Full map: units + race + isolation + 2 E2E (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:24:24.490Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_016wNkSKGArZFFzxvxVN3B7i",
        "questions": [
          {
            "question": "D10 — Issue 6: 5 sequential IDP calls per validation. Promise.all as planned, or bounded parallelism plus caching?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:31-32 (\"5 sequential API calls to the IDP; they could be parallelized via Promise.all trivially\").\nELI10: Parallelizing is right, but \"trivially\" hides two problems. Promise.all is fail-fast: when one call rejects, the other four keep running against the IDP with nobody listening, so a flaky IDP now costs 5 wasted calls per failed validation instead of 1. And per-tenant IDPs usually rate-limit; going from 1 to 5 concurrent calls per request multiplies your burst. Separately, at least two of the five calls (discovery document, JWKS signing keys) are static-ish and standard practice is to cache them with a TTL and refresh on unknown key id, which removes those calls entirely rather than speeding them up.\nStakes if we pick wrong: Under IDP degradation the naive version amplifies load on the thing that is already failing, and validation latency stays bound by the slowest of five network calls.\nRecommendation: A because AbortController plus a shared signal makes fail-fast actually cancel, per-call timeouts bound the tail, and caching discovery and JWKS is Layer 1 practice that turns 5 calls into 3 or fewer on the hot path.\nCompleteness: A=10/10, B=6/10, C=3/10\nNet: fewer, bounded, cancellable IDP calls versus five unbounded calls that pile onto a degraded IDP.",
            "header": "Perf 6",
            "multiSelect": false,
            "options": [
              {
                "label": "6A) Cancel-on-fail + timeouts + cache discovery/JWKS (recommended)",
                "description": "✅ Promise.all over calls sharing one AbortSignal, per-call AbortSignal.timeout, and a TTL cache for discovery and JWKS with refresh on unknown kid (human: ~1.5 days / CC: ~25 min). ✅ Hot path drops to 3 or fewer network calls; failures are typed and bounded; IDP burst per request is capped. ❌ JWKS caching needs the unknown-kid refresh path and its test, or a key rotation locks tenants out."
              },
              {
                "label": "6B) Promise.all + per-call timeouts only",
                "description": "✅ Latency drops from sum-of-5 to max-of-5 with bounded tails (human: ~3 hr / CC: ~8 min). ✅ No new cache surface to reason about. ❌ First rejection still leaves four calls running; still 5 calls per validation and 5x burst against rate-limited IDPs."
              },
              {
                "label": "6C) Bare Promise.all as PLAN.md states",
                "description": "✅ One-line change, exactly what the plan proposes. ✅ Immediate latency win on the happy path. ❌ No timeouts, no cancellation, no caching: a hung IDP call hangs validation, and failures amplify IDP load."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D10 — Issue 6: 5 sequential IDP calls per validation. Promise.all as planned, or bounded parallelism plus caching?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:31-32 (\"5 sequential API calls to the IDP; they could be parallelized via Promise.all trivially\").\nELI10: Parallelizing is right, but \"trivially\" hides two problems. Promise.all is fail-fast: when one call rejects, the other four keep running against the IDP with nobody listening, so a flaky IDP now costs 5 wasted calls per failed validation instead of 1. And per-tenant IDPs usually rate-limit; going from 1 to 5 concurrent calls per request multiplies your burst. Separately, at least two of the five calls (discovery document, JWKS signing keys) are static-ish and standard practice is to cache them with a TTL and refresh on unknown key id, which removes those calls entirely rather than speeding them up.\nStakes if we pick wrong: Under IDP degradation the naive version amplifies load on the thing that is already failing, and validation latency stays bound by the slowest of five network calls.\nRecommendation: A because AbortController plus a shared signal makes fail-fast actually cancel, per-call timeouts bound the tail, and caching discovery and JWKS is Layer 1 practice that turns 5 calls into 3 or fewer on the hot path.\nCompleteness: A=10/10, B=6/10, C=3/10\nNet: fewer, bounded, cancellable IDP calls versus five unbounded calls that pile onto a degraded IDP.": "6A) Cancel-on-fail + timeouts + cache discovery/JWKS (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:24:46.590Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_01EaGbiNdd6gqQMbuwLcUT2o",
        "questions": [
          {
            "question": "D11 — TODO 1: RequestPolicy (deferred in D4).\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:35-36.\nWhat: Introduce a RequestPolicy type once a concrete consumer needs per-request policy decisions beyond what the adapter's policy-version key already provides.\nWhy: The scope reduction dropped it because no plan section names who calls it; capturing it keeps the author's intent from being lost.\nPros: Preserves the design idea with the reasoning; a future implementer starts from the seam the author saw. Cons: Risk of building a type nobody calls if the need never materialises.\nContext: PLAN.md listed RequestPolicy among 4 new classes with no description. The adapter already keys on policy version. Start by grepping call sites that branch on tenant policy after the refactor lands; if there are 2+, that is the consumer.\nDepends on: Refactor merged (D4 scope).\nRecommendation: A because the idea had an author behind it and a TODO with context costs nothing.\nNote: options differ in kind, not coverage — no completeness score.\nNet: keep the idea with its reasoning versus let it vanish with the scope cut.",
            "header": "TODO 1",
            "multiSelect": false,
            "options": [
              {
                "label": "A) Add to TODOS.md (recommended)",
                "description": "✅ The seam and its trigger condition are recorded for whoever hits the need (P3, Effort M). ✅ Nothing is built speculatively now. ❌ One more backlog item that may never be picked up."
              },
              {
                "label": "B) Skip, not valuable enough",
                "description": "✅ Backlog stays clean; the idea can be re-derived if the need appears. ✅ Zero bookkeeping. ❌ The author's reasoning for wanting it is lost with the scope cut."
              },
              {
                "label": "C) Build it now in this PR",
                "description": "✅ Every seam the author envisioned ships together. ✅ No follow-up structural change. ❌ Reverses D4 and adds a type with no stated consumer to an auth diff."
              }
            ]
          },
          {
            "question": "D12 — TODO 2: Delete legacyAuthFlow() and the per-tenant flag after migration (from D6).\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:27-28.\nWhat: Once every tenant runs on the AuthBroker path, remove legacyAuthFlow(), the routing flag, and the parity tests that compare the two paths.\nWhy: A strangler flag left in place forever becomes two auth code paths to maintain and an accidental rollback nobody remembers exists.\nPros: The refactor actually finishes; dead auth code is removed. Cons: Requires confirming 100% tenant migration first, which needs a metric or flag audit.\nContext: D6 chose per-tenant flag routing. Start by adding a counter of requests served by the legacy path; when it reads zero for a full cycle, delete. The characterization tests move from parity assertions to asserting the new path alone.\nDepends on: All tenants flagged onto the new path.\nRecommendation: A because a strangler without a scheduled demolition is just two code paths.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a planned cleanup versus a permanent dual path.",
            "header": "TODO 2",
            "multiSelect": false,
            "options": [
              {
                "label": "A) Add to TODOS.md (recommended)",
                "description": "✅ The cleanup has an owner condition and a start point (P2, Effort S). ✅ Prevents the flag from becoming permanent architecture. ❌ Requires the legacy-path counter to be part of the flag work now."
              },
              {
                "label": "B) Skip, not valuable enough",
                "description": "✅ No backlog entry to track. ✅ Nothing changes in this PR. ❌ The dual path has no scheduled end and will outlive everyone's memory of why it exists."
              },
              {
                "label": "C) Build it now in this PR",
                "description": "✅ No dual path ever exists. ✅ Smallest final codebase immediately. ❌ Contradicts D6; deleting the legacy path now removes the rollback the flag exists to provide."
              }
            ]
          },
          {
            "question": "D13 — TODO 3: Audit the rest of the auth module for the swallow-and-continue try/catch pattern (from D8).\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:23-24.\nWhat: Grep the auth module for catch blocks that neither rethrow nor return an explicit failure, and route them through the error boundary introduced in D8.\nWhy: validateAndDispatch() is unlikely to be the only place the pattern appears; the same silent-failure class probably exists in siblings.\nPros: One error boundary becomes the module convention; on-call sees every auth failure. Cons: Touches files outside this refactor's diff; each site needs its own test.\nContext: D8 introduces a typed Result pipeline and a single boundary. Start with a grep for `catch` blocks in the auth directory whose body has no throw, no return of an error, and no log call.\nDepends on: D8 pipeline merged so there is a boundary to route to.\nRecommendation: A because it is separate scope (other files) but the same root cause, and root-cause fixes belong where all callers route through.\nNote: options differ in kind, not coverage — no completeness score.\nNet: module-wide visibility of auth failures versus fixing one function and hoping.",
            "header": "TODO 3",
            "multiSelect": false,
            "options": [
              {
                "label": "A) Add to TODOS.md (recommended)",
                "description": "✅ The sibling sites get fixed with the same boundary once it exists (P2, Effort M). ✅ Keeps this PR's diff scoped to the plan while not losing the finding. ❌ Silent failures elsewhere persist until the follow-up lands."
              },
              {
                "label": "B) Skip, not valuable enough",
                "description": "✅ No extra backlog. ✅ Assumes validateAndDispatch() was the outlier. ❌ If it was not, the same 3am invisibility remains in neighbouring code."
              },
              {
                "label": "C) Build it now in this PR",
                "description": "✅ Whole module converges on one error convention in a single change. ✅ No follow-up needed. ❌ Widens an auth diff past the agreed 7 files and mixes unrelated behavior changes into the refactor."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D11 — TODO 1: RequestPolicy (deferred in D4).\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:35-36.\nWhat: Introduce a RequestPolicy type once a concrete consumer needs per-request policy decisions beyond what the adapter's policy-version key already provides.\nWhy: The scope reduction dropped it because no plan section names who calls it; capturing it keeps the author's intent from being lost.\nPros: Preserves the design idea with the reasoning; a future implementer starts from the seam the author saw. Cons: Risk of building a type nobody calls if the need never materialises.\nContext: PLAN.md listed RequestPolicy among 4 new classes with no description. The adapter already keys on policy version. Start by grepping call sites that branch on tenant policy after the refactor lands; if there are 2+, that is the consumer.\nDepends on: Refactor merged (D4 scope).\nRecommendation: A because the idea had an author behind it and a TODO with context costs nothing.\nNote: options differ in kind, not coverage — no completeness score.\nNet: keep the idea with its reasoning versus let it vanish with the scope cut.": "A) Add to TODOS.md (recommended)",
          "D12 — TODO 2: Delete legacyAuthFlow() and the per-tenant flag after migration (from D6).\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:27-28.\nWhat: Once every tenant runs on the AuthBroker path, remove legacyAuthFlow(), the routing flag, and the parity tests that compare the two paths.\nWhy: A strangler flag left in place forever becomes two auth code paths to maintain and an accidental rollback nobody remembers exists.\nPros: The refactor actually finishes; dead auth code is removed. Cons: Requires confirming 100% tenant migration first, which needs a metric or flag audit.\nContext: D6 chose per-tenant flag routing. Start by adding a counter of requests served by the legacy path; when it reads zero for a full cycle, delete. The characterization tests move from parity assertions to asserting the new path alone.\nDepends on: All tenants flagged onto the new path.\nRecommendation: A because a strangler without a scheduled demolition is just two code paths.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a planned cleanup versus a permanent dual path.": "A) Add to TODOS.md (recommended)",
          "D13 — TODO 3: Audit the rest of the auth module for the swallow-and-continue try/catch pattern (from D8).\nProject/branch/task: gstack-plan-count-b3qdhZ on main, PLAN.md:23-24.\nWhat: Grep the auth module for catch blocks that neither rethrow nor return an explicit failure, and route them through the error boundary introduced in D8.\nWhy: validateAndDispatch() is unlikely to be the only place the pattern appears; the same silent-failure class probably exists in siblings.\nPros: One error boundary becomes the module convention; on-call sees every auth failure. Cons: Touches files outside this refactor's diff; each site needs its own test.\nContext: D8 introduces a typed Result pipeline and a single boundary. Start with a grep for `catch` blocks in the auth directory whose body has no throw, no return of an error, and no log call.\nDepends on: D8 pipeline merged so there is a boundary to route to.\nRecommendation: A because it is separate scope (other files) but the same root cause, and root-cause fixes belong where all callers route through.\nNote: options differ in kind, not coverage — no completeness score.\nNet: module-wide visibility of auth failures versus fixing one function and hoping.": "A) Add to TODOS.md (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:25:54.870Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_01Je2eR9CH4vWsDYmEdCnsAP",
        "questions": [
          {
            "question": "D14 — Next step after this eng review?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, reviewed plan written to gstack-test-plan-eng.md.\nELI10: The eng review is the only gate that blocks shipping and it is clear. No UI is touched, so a design review does not apply. A CEO review is optional and normally for product-direction changes; this is a backend auth refactor, so it is a soft mention only.\nStakes if we pick wrong: Low either way; the CEO review would cost time on a change with no product-facing scope decision left open.\nRecommendation: A because all required reviews are complete and the plan's remaining blocker is the author confirming the Context section, not another review.\nNote: options differ in kind, not coverage — no completeness score.\nNet: start implementing versus an optional strategy pass on a backend refactor.",
            "header": "Next",
            "multiSelect": false,
            "options": [
              {
                "label": "A) Ready to implement (recommended)",
                "description": "✅ All relevant reviews complete; run /ship when the work is done. ✅ The first task is the author confirming Context, then T1 characterization tests. ❌ No second strategic opinion on whether the refactor is the right thing to build now."
              },
              {
                "label": "B) Run /plan-ceo-review",
                "description": "✅ Adds a scope-and-strategy pass before any code is written. ✅ Useful if the refactor's business motivation is contested. ❌ Backend-only refactor with no product-direction choice; likely low yield for the time."
              }
            ]
          }
        ],
        "answered": true,
        "failed": false,
        "answers": {
          "D14 — Next step after this eng review?\nProject/branch/task: gstack-plan-count-b3qdhZ on main, reviewed plan written to gstack-test-plan-eng.md.\nELI10: The eng review is the only gate that blocks shipping and it is clear. No UI is touched, so a design review does not apply. A CEO review is optional and normally for product-direction changes; this is a backend auth refactor, so it is a soft mention only.\nStakes if we pick wrong: Low either way; the CEO review would cost time on a change with no product-facing scope decision left open.\nRecommendation: A because all required reviews are complete and the plan's remaining blocker is the author confirming the Context section, not another review.\nNote: options differ in kind, not coverage — no completeness score.\nNet: start implementing versus an optional strategy pass on a backend refactor.": "A) Ready to implement (recommended)"
        },
        "unansweredQuestionIndices": [],
        "answeredAt": "2026-09-10T03:29:41.500Z"
      }
    ],
    "assistantMessages": [
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "Running the plan-eng-review preamble, then reviewing PLAN.md as the review target.",
        "timestamp": "2026-09-10T03:18:33.274Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "The preamble fired a one-time onboarding directive about CLAUDE.md skill routing. Asking that first, as instructed.",
        "timestamp": "2026-09-10T03:18:52.415Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "I've noted the routing rules addition, but the CLAUDE.md update and commit will wait until plan mode ends. Now I'm checking the design doc, recovering context, and reading PLAN.md along with the review-sections file.\n\n",
        "timestamp": "2026-09-10T03:19:13.106Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "Preflight results: no design doc, Codex outside voice is disabled in config, no learnings on file, and cross-project learnings is unset. Two setup questions before Step 0.",
        "timestamp": "2026-09-10T03:20:33.830Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "I've completed step 0: the plan wraps an existing tenant-keyed cache in a redundant facade, rewrites `legacyAuthFlow()` instead of reusing it, and never states the refactor's user-facing goal. It also trips complexity thresholds (12 files, 5 new types), and my research shows the global singleton export adds nothing over constructor injection, `Promise.all` risks leaving IDP calls in flight on failure, and JWKS/discovery caching could eliminate those calls entirely — I'll carry these as findings.",
        "timestamp": "2026-09-10T03:22:02.107Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "Scope reduced per D4. Two new types, existing adapter injected. Committing to that; no more scope re-argument. Now Section 1, Architecture. Three issues, one question each.",
        "timestamp": "2026-09-10T03:22:34.819Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "Architecture section wrapped up with all three issues resolved. Moving to Code Quality—found one potential issue there, but the duplicate cache-write logic concern is already addressed by the D5 single-writer decision, so I'll skip re-raising it.",
        "timestamp": "2026-09-10T03:23:35.656Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "Code Quality done, one issue, complete option chosen. Section 3, Tests.\n\nThe regression rule applies with no question: `legacyAuthFlow()` is existing behavior being rewritten with zero regression coverage (PLAN.md:27-28, and PLAN.md:15-16 explicitly excludes it). Characterization tests for `legacyAuthFlow()` go into the plan as a CRITICAL requirement, written before the rewrite starts, and run against both paths under the D6 flag.\n\nCoverage map for the planned code (no test framework or source is present in this fixture repo, so every path is a GAP today):\n\n```\nCODE PATHS                                                USER FLOWS\n[~] legacyAuthFlow() (rewritten)                          [+] Tenant login via new path\n  └── [GAP] [CRITICAL] characterization: valid / expired    ├── [GAP] [→E2E] login → mint → validated request\n      / revoked / wrong-tenant / IDP down                   ├── [GAP] [→E2E] tenant suspended mid-session\n[+] AuthBroker (single writer, versioned write)             └── [GAP]        flag off → legacy path, parity\n  ├── [GAP] write with current generation → stored         [+] Error states\n  ├── [GAP] write with stale generation → dropped + logged   ├── [GAP] IDP timeout → explicit error, retryable\n  └── [GAP] tenant A key never readable via tenant B         ├── [GAP] malformed token → explicit reject\n[+] SessionMint (reads, requests mint)                       └── [GAP] policy miss → explicit reject, not pass\n  ├── [GAP] cache hit → no IDP call\n  ├── [GAP] cache miss → broker mint → stored\n  └── [GAP] invalidation during mint → no resurrection\n[+] validateAndDispatch() pipeline\n  ├── [GAP] each step happy path\n  ├── [GAP] each error class → distinct outcome + log\n  └── [GAP] boundary table test: unknown error → fail closed\n[+] IDP validation (parallel calls)\n  ├── [GAP] all 5 succeed\n  ├── [GAP] one rejects → others cancelled, typed error\n  └── [GAP] one hangs → per-call timeout fires\n\nCOVERAGE: 0/19 paths tested (0%)  |  GAPS: 19 (1 CRITICAL regression, 2 E2E)\n```",
        "timestamp": "2026-09-10T03:24:07.566Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "All four sections are done, and since codex_reviews is disabled, I'm skipping the Codex review (re-enable with `gstack-config set codex_reviews enabled`). I'll note that and check the TODO format before moving to the TODO questions.\n\n",
        "timestamp": "2026-09-10T03:25:05.174Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "Moving to the TODO candidates now, one question each. Since TODOS.md doesn't exist and plan mode blocks file creation, I'll record these items in the plan's TODO section and write them to TODOS.md once plan mode exits.",
        "timestamp": "2026-09-10T03:25:13.361Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "All decisions are in: D4's scope was reduced, D5-D10 went with the complete remedy, and three TODOs were accepted. Now I'll generate the tasks JSONL, review log, decision log, test-plan artifact, and the reviewed plan with its report.",
        "timestamp": "2026-09-10T03:26:25.388Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "Exit gate checks all pass — Eng Review is clear, both log entries match HEAD with no staleness, and the review readiness dashboard confirms CLEARED status.\n\n",
        "timestamp": "2026-09-10T03:29:34.661Z"
      },
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "text": "All relevant reviews complete. Run /ship when ready. Logging telemetry and the background brain refresh, then exiting plan mode.",
        "timestamp": "2026-09-10T03:29:46.388Z"
      }
    ],
    "planReadyRequests": [
      {
        "sessionId": "e5829792-573f-4de0-8cbc-97379840c953",
        "toolUseId": "toolu_019TVvkeXoLv89EKxXSXZHjD",
        "timestamp": "2026-09-10T03:29:49.951Z",
        "failed": false
      }
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  "screen": "\n GSTACK REVIEW REPORT\n\n ┌───────────┬──────────────────────────┬────────────────────┬──────┬───────────┬─────────────────────────────────┐\n │  Review   │         Trigger          │        Why         │ Runs │  Status   │            Findings             │\n ├───────────┼──────────────────────────┼────────────────────┼──────┼───────────┼─────────────────────────────────┤\n │ CEO       │ /plan-ceo-review         │ Scope & strategy   │ 0    │ —         │ —                               │\n │ Review    │                          │                    │      │           │                                 │\n ├───────────┼──────────────────────────┼────────────────────┼──────┼───────────┼─────────────────────────────────┤\n │ Outside   │ codex via                │ Independent 2nd    │      │           │ 0 (skipped, host=claude,        │\n │ Review    │ /plan-eng-review         │ opinion            │ 1    │ disabled  │ provider=codex,                 │\n │           │ (disabled)               │                    │      │           │ phase=plan-review)              │\n ├───────────┼──────────────────────────┼────────────────────┼──────┼───────────┼─────────────────────────────────┤\n │ Eng       │ /plan-eng-review         │ Architecture &     │ 1    │ clean     │ 24 issues, 0 critical gaps,     │\n │ Review    │                          │ tests (required)   │      │ (PLAN)    │ mode SCOPE_REDUCED              │\n ├───────────┼──────────────────────────┼────────────────────┼──────┼───────────┼─────────────────────────────────┤\n │ Design    │ /plan-design-review      │ UI/UX gaps         │ 0    │ —         │ —                               │\n │ Review    │                          │                    │      │           │                                 │\n ├───────────┼──────────────────────────┼────────────────────┼──────┼───────────┼─────────────────────────────────┤\n │ DX Review │ /plan-devex-review       │ Developer          │ 0    │ —         │ —                               │\n │           │                          │ experience gaps    │      │           │                                 │\n └───────────┴──────────────────────────┴────────────────────┴──────┴───────────┴─────────────────────────────────┘\n\n OUTSIDE COVERAGE: provider codex, phase plan-review, outside_status disabled (user opt-out via\n codex_reviews=disabled); no native fallback dispatched; 0 findings. Outside coverage is absent, not clean.\n\n VERDICT: ENG CLEARED — ready to implement once Prerequisite P0 (author confirms Context) is done. Outside review\n disabled by config.\n\n NO UNRESOLVED DECISIONS\n╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌\n\n────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────\n Claude has written up a plan and is ready to execute. Would you like to proceed?\n\n ❯ 1. Yes, and use auto mode\n   2. Yes, manually approve edits\n   3. Tell Claude what to change\n      shift+tab to approve with this feedback\n",
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    "plan": "# Plan: Multi-tenant Auth Refactor (reviewed)\n\n<!-- Reviewed target: PLAN.md (\"Plan: Multi-tenant Auth Refactor\") in /tmp/g-pyj7vm4y/gstack-paid-shard-y9e8et/tmp/gstack-plan-count-G18mVB, branch main, commit 6976fd2. Reviewed by /plan-eng-review on 2026-09-16, session 3338023-1789537921-bc834bca. Scope: reduced per recommendation (D4, D5, D6). -->\n\n## Context\n\nTenant-auth orchestration lives in `legacyAuthFlow()` and a 60-line `validateAndDispatch()` with three nested, error-swallowing try/catch blocks. The goal is to reorganize that orchestration without changing product behavior: same allow/deny outcomes, same status codes, same cache side effects, same IDP call sequence. The original plan proposed 5 new classes across 12 files and no regression coverage for the flow it rewrites. This review cut the plan to 2 classes plus one pure function across ~8 files, made the shared cache dependency explicit, flattened the error handling, and made the \"no behavior change\" claim checkable with characterization fixtures recorded before any rewrite.\n\nEvidence base: `PLAN.md` only. The fixture repo holds no source or tests, so every finding below quotes plan lines and is a proposal-level finding; runtime behavior is marked unknown where the plan does not state it.\n\n## Context supplied by the plan author (retained)\nThe goal is to reorganize existing tenant-auth orchestration without changing\nits product behavior. RequestPolicy groups the existing per-request access\ndecision: given already-fetched claims and tenant/request context, it returns\nallow or deny under the existing access policy. AuthBroker.validateAndDispatch()\ncalls it after validation and before dispatch. It adds no policy, network call,\ncache mutation or state. Its separate class boundary remains a proposal to review.\n\n## Existing contracts retained (unchanged)\nThe existing cache adapter keys entries by tenant ID, issuer, audience,\nand policy version. It evicts expired tokens and invalidates entries on\nlogout, token revocation, or tenant suspension. These validity and tenant-key\nrules are unchanged; they do not serialize mutations. The adapter, its\ninvalidation hooks, and their existing tests remain in use unchanged. There is\none backing cache.\n\n## Reviewed architecture (accepted: D6, D7)\n\nComponents:\n- `AuthBroker` (class) — owns `validateAndDispatch(req)`. Constructor takes `{ cache, idp, clock, logger }`.\n- `SessionMint` (class) — owns session minting. Constructor takes `{ cache, clock, logger }`.\n- `decideAccess(claims, ctx): AccessDecision` (pure function module, replaces the proposed `RequestPolicy` class) — no imports of adapter, IDP client or clock. `AccessDecision = { kind: 'allow' } | { kind: 'deny', reason }`.\n- Composition root (existing app bootstrap module) — creates the single cache adapter instance once and passes it to both services. No module-level exported cache instance anywhere.\n- Dropped from the original plan: `AuthCache` facade (D6: adds no behavior over the adapter), `TokenStore` (D5: never described; adapter already owns token persistence).\n\nData flow:\n\n```\nrequest ──► AuthBroker.validateAndDispatch(req)\n              │  1. fetchClaims(req)       ──► IDP client (5 sequential calls, unchanged this PR)\n              │  2. lookupCache(key)       ──► injected cache adapter (tenant, issuer, audience, policyVer)\n              │                                 hit / miss / expired→evict, exactly as today\n              │  3. decideAccess(claims, ctx)   pure: allow | deny(reason)\n              │  4. dispatch(handler) on allow  |  reject with today's status on deny\n              │\n              └─ single catch: KnownErrorClass ─► today's observable outcome + 1 structured log line\n                               unknown error   ─► rethrow (never swallowed)\n\nSessionMint.mint(claims) ──► writes one session entry via the SAME injected adapter\n                              (invalidated by existing logout / revocation / tenant-suspension hooks)\n\nComposition root:  const cache = createCacheAdapter(...)   // once\n                   new AuthBroker({ cache, idp, clock, logger })\n                   new SessionMint({ cache, clock, logger })\n```\n\n## Code quality (accepted: D8)\n\n`validateAndDispatch()` becomes a linear pipeline of four named helpers (`fetchClaims`, `lookupCache`, `decideAccess`, `dispatch`) with one `catch`. The catch maps each error class the three nested blocks swallow today to the exact observable outcome it produces today, and emits one structured log/metric per formerly silent path. Unknown errors rethrow. Ordering constraint: the R6 characterization fixtures (below) land first so each error class's current outcome is known before it is mapped. The only intentional difference from today is the additive logging.\n\n## Tests (accepted: D9, plus required proof of D6/D7/D8)\n\nFramework: unknown from this repo (no `package.json`, no test files). `Promise.all` in the plan implies JS/TS; file names below assume `*.test.ts`. Confirm at implementation; do not install anything as part of this plan.\n\nRegression contract for `legacyAuthFlow()` (CRITICAL, D9):\n- Behavior to preserve: allow/deny outcome, HTTP status, response shape, cache side effects (writes/evictions), IDP call sequence.\n- Input matrix: valid token cache-miss; valid token cache-hit; expired token; revoked token; tenant suspended; wrong issuer; wrong audience; policy-version mismatch; policy deny; IDP timeout at call k (k=1..5); IDP 5xx at call k; malformed token; missing token; suspension hook firing between cache lookup and dispatch.\n- Intentional differences: additive structured logging only.\n- Acceptance: record fixtures from `legacyAuthFlow()` BEFORE any rewrite into `auth/__fixtures__/legacy-auth-flow.json`; replay against the new `AuthBroker` path in `auth/AuthBroker.regression.test.ts`; byte-identical outcome per fixture. Plus 3 HTTP-level E2E flows [→E2E]: valid token → handler runs; revoked token → today's status; suspended tenant → today's status.\n- Ordering: fixtures are the first commit on the branch.\n\nRequired proof of approved contracts (no separate decision needed):\n- D6 `decideAccess`: table-driven test over claims × ctx cases (`auth/decideAccess.test.ts`); module-boundary test asserting the module imports no adapter/IDP/clock.\n- D7 wiring: each service constructed with a fake adapter, asserting only that adapter is touched (`auth/AuthBroker.test.ts`, `auth/SessionMint.test.ts`); composition-root test asserting both services receive the same instance (`bootstrap/auth.test.ts`).\n- D8 pipeline: one test per known error class asserting outcome + log emission; one test asserting an unknown error propagates.\n\nCoverage diagram (all paths are planned; every branch is a GAP until the tests above land):\n\n```\nCODE PATHS                                                   USER FLOWS\n[+] auth/AuthBroker.ts                                       [+] Authenticated request\n  ├── validateAndDispatch()                                    ├── [GAP] [→E2E] valid token → handler runs\n  │   ├── [GAP] fetchClaims: 5 IDP calls ok                    ├── [GAP] [→E2E] revoked token → today's 401\n  │   ├── [GAP] fetchClaims: IDP timeout at call k (k=1..5)    └── [GAP] [→E2E] suspended tenant → today's status\n  │   ├── [GAP] fetchClaims: IDP 5xx at call k               [+] Error states\n  │   ├── [GAP] lookupCache: hit / miss / expired-evicted       ├── [GAP] IDP down → today's error + 1 log line\n  │   ├── [GAP] decideAccess → allow → dispatch                 ├── [GAP] malformed / missing token → today's 4xx\n  │   ├── [GAP] decideAccess → deny → today's reject            └── [GAP] suspension hook fires mid-request\n  │   ├── [GAP] known error class → mapped outcome + log      [+] Concurrency\n  │   └── [GAP] unknown error → rethrows                        ├── [GAP] two requests, same tenant, cache miss\n[+] auth/decideAccess.ts (pure)                                └── [GAP] logout during in-flight mint\n  ├── [GAP] table: each claims × ctx case → allow/deny\n  └── [GAP] purity: module imports no adapter/IDP/clock\n[+] auth/SessionMint.ts\n  ├── [GAP] mint writes one entry via injected adapter\n  ├── [GAP] mint with revoked/suspended claims → no write\n  └── [GAP] adapter write failure → today's outcome\n[+] bootstrap (composition root)\n  └── [GAP] both services receive the same adapter instance\n[+] legacyAuthFlow() equivalence (R6)\n  └── [GAP] [→E2E] characterization fixtures old == new\n\nLLM integration: none\n\nCOVERAGE: 0/22 paths tested (0%)  |  Code paths: 0/14 (0%)  |  User flows: 0/8 (0%)\nQUALITY: n/a (no existing tests for these paths)  |  GAPS: 22 (4 E2E, 0 eval)\n```\n\nLegend: ★★★ behavior + edge + error | ★★ happy path | ★ smoke | [→E2E] integration test needed | [→EVAL] LLM eval (none).\n\n## Performance\n\n- 5 sequential IDP calls stay sequential in this PR (D4). Parallelization is a follow-up PR (see NOT in scope and TODOs).\n- Assumption to verify during fixture recording: whether a cache hit short-circuits the 5 IDP calls. The R6 fixtures capture the IDP call sequence per input and answer this for free (TODO 2).\n- No new allocation or N+1 pattern: one backing cache, unchanged adapter.\n\n## Files touched (~8, down from 12)\n\n- `auth/AuthBroker.ts` (new: class, linear pipeline, error map)\n- `auth/SessionMint.ts` (new: class)\n- `auth/decideAccess.ts` (new: pure function)\n- `auth/legacyAuthFlow.ts` (rewritten to delegate / removed once regression suite is green)\n- bootstrap / composition root module (wire one adapter into both services; remove any module-level cache export)\n- `auth/__fixtures__/legacy-auth-flow.json` (new)\n- `auth/AuthBroker.regression.test.ts`, `auth/AuthBroker.test.ts`, `auth/SessionMint.test.ts`, `auth/decideAccess.test.ts`, `bootstrap/auth.test.ts`, E2E spec (new)\n- Any existing ASCII diagram in touched files (check and update in the same commit)\n\nExact paths follow the repo's existing layout; the names above are the pattern.\n\n## Implementation order\n\n1. Record characterization fixtures against current `legacyAuthFlow()` (T1). Commit.\n2. `decideAccess` + tests (T2). Independent of step 1.\n3. `AuthBroker`, `SessionMint`, composition root wiring + unit tests (T3, T4, T5).\n4. Regression replay + 3 E2E flows green (T6). Then retire `legacyAuthFlow()`.\n5. Diagram check, cleanup (T7, T8).\n\n## What already exists\n\n| Existing | Plan's use | Verdict |\n|---|---|---|\n| Cache adapter (tenant/issuer/audience/policy-version keys, eviction, logout/revocation/suspension hooks, tests) — `PLAN.md:15-21` | Reused unchanged; both services depend on it directly (D6 dropped the facade) | Reused, correctly |\n| Per-request allow/deny logic — `PLAN.md:8-10` | Regrouped into `decideAccess` pure function | Reused, moved |\n| `legacyAuthFlow()` — `PLAN.md:35` | Rewritten; now also the oracle for the characterization fixtures | Reused as test oracle before removal |\n| App bootstrap / composition root (assumed to exist; unverified) | Gains the single adapter instance wiring | Reused |\n\n## NOT in scope\n\n- **IDP call parallelization (Promise.all / allSettled)** — deferred by D4 to a follow-up PR. Must ship with p50/p95 before/after validation latency, a fail-fast error-ordering test, and confirmed IDP rate-limit headroom at 5x burst. Reuses the R6 fixtures as its regression suite.\n- **TokenStore** — cut by D5. The adapter already owns token persistence, eviction and invalidation. Re-propose only with a written responsibility contract.\n- **AuthCache facade** — dropped by D6. Adds no behavior over the adapter; services depend on the adapter directly.\n- **Cache-hit short-circuit of IDP calls** — if fixtures show a hit still makes 5 calls, that is a behavior change (revocation freshness) and gets its own PR (TODO 2).\n- **Changing any allow/deny outcome, status code, response shape or invalidation rule** — explicitly out of scope; the plan is a pure move plus additive logging.\n- **Distribution** — no new artifact (binary, package, container); nothing to publish. N/A.\n\n## Diagrams\n\nPlan-level: the data-flow diagram above. Inline ASCII diagram comments to add in implementation:\n- `auth/AuthBroker.ts` — the 4-step pipeline with the error map (Service with a multi-step pipeline).\n- bootstrap / composition root — one-line diagram showing the single adapter fanning into both services.\n- `auth/decideAccess.ts` — a small decision table comment (claims × ctx → allow/deny) if the table exceeds ~6 rows.\nCheck any existing diagrams in touched files and update them in the same commit.\n\n## Failure modes\n\n| New codepath | Realistic production failure | Test | Handling | User sees |\n|---|---|---|---|---|\n| `fetchClaims` | IDP timeout / 5xx on call k | yes (fixtures k=1..5) | yes (error map → today's outcome) | today's error + operators now get a log line |\n| `lookupCache` | adapter throws / stale entry after suspension | yes (fixture + mid-flight case) | yes (error map) | today's outcome |\n| `decideAccess` | malformed claims → throws | yes (table) | unknown error rethrows, not swallowed | today's outcome if it threw today; otherwise surfaces loudly (fixtures decide) |\n| `dispatch` | handler throws | fixture (passes through as today) | outside auth scope | as today |\n| `SessionMint.mint` | adapter write fails | yes | today's outcome | as today |\n| Composition root | two adapter instances created by mistake | yes (same-instance test) | test-time failure | never reaches users |\n| Suspension hook mid-request | race between lookup and dispatch | yes (fixture) | as today | as today |\n\nCritical gaps (no test AND no handling AND silent): **0**. Every path above has a planned test and either mapped handling or an explicit rethrow.\n\n## Worktree parallelization strategy\n\n| Step | Modules touched | Depends on |\n|---|---|---|\n| T1 fixtures | `auth/__fixtures__/`, `auth/*.test.ts` | — |\n| T2 decideAccess | `auth/decideAccess*` | — |\n| T3-T5 AuthBroker, SessionMint, composition root | `auth/`, bootstrap | T1 (outcomes to map), T2 |\n| T6 regression replay + E2E | `auth/*.test.ts`, e2e/ | T1, T3-T5 |\n| T7-T8 cleanup, diagrams | `auth/`, bootstrap | T3-T6 |\n\nLanes:\n- Lane A: T1 (independent)\n- Lane B: T2 (independent)\n- Lane C: T3 → T4 → T5 → T6 → T7 → T8 (sequential, shared `auth/`)\n\nExecution order: launch A + B in parallel worktrees. Merge both. Then C.\nConflict flag: Lanes A and C both touch `auth/` (A only adds `__fixtures__/` and one characterization test file; C adds implementation). Low overlap; keep fixture file names distinct from implementation test names.\n\n## Implementation Tasks\nSynthesized from this review's findings. Each task derives from a specific\nfinding above. Run with Claude Code or Codex; checkbox as you ship.\n\n- [ ] **T1 (P1, human: ~1 day / CC: ~20 min)** — auth fixtures — Record `legacyAuthFlow()` characterization fixtures for the full R6 input matrix before any rewrite\n  - Surfaced by: Test review — T1 CRITICAL, `PLAN.md:35-36` \"no regression test for the prior behavior is planned\" (D9)\n  - Files: `auth/__fixtures__/legacy-auth-flow.json`, `auth/legacyAuthFlow.characterization.test.ts`\n  - Verify: fixture count matches the matrix (14 classes + k=1..5 variants); test suite green against current code\n- [ ] **T2 (P1, human: ~half day / CC: ~10 min)** — decideAccess — Extract the allow/deny decision into a pure `decideAccess(claims, ctx)` module with table test and purity test\n  - Surfaced by: Scope Challenge S6 / Code quality C2, `PLAN.md:8-12` (D6)\n  - Files: `auth/decideAccess.ts`, `auth/decideAccess.test.ts`\n  - Verify: table test covers every claims × ctx row; boundary test fails if the module imports adapter/IDP/clock\n- [ ] **T3 (P1, human: ~1 day / CC: ~20 min)** — AuthBroker — Build `AuthBroker` with constructor-injected `{ cache, idp, clock, logger }` and a linear `fetchClaims → lookupCache → decideAccess → dispatch` pipeline with one error-to-outcome map and one log line per mapped error\n  - Surfaced by: Architecture A1 `PLAN.md:27-28` (D7); Code quality C1 `PLAN.md:31-32` (D8)\n  - Files: `auth/AuthBroker.ts`, `auth/AuthBroker.test.ts`\n  - Verify: one test per known error class (outcome + log); unknown error propagates; fake adapter is the only cache touched\n- [ ] **T4 (P1, human: ~half day / CC: ~10 min)** — SessionMint — Build `SessionMint` with constructor-injected `{ cache, clock, logger }`\n  - Surfaced by: Architecture A1 (D7); Scope D6\n  - Files: `auth/SessionMint.ts`, `auth/SessionMint.test.ts`\n  - Verify: mint writes exactly one entry via the injected adapter; revoked/suspended claims write nothing; adapter failure yields today's outcome\n- [ ] **T5 (P1, human: ~2h / CC: ~10 min)** — composition root — Create the single adapter instance once and pass it to both services; delete any module-level exported cache instance\n  - Surfaced by: Architecture A1, `PLAN.md:27-28` \"via module-level export\" (D7)\n  - Files: bootstrap module, `bootstrap/auth.test.ts`\n  - Verify: test asserts `broker.cache === mint.cache`; grep shows no module-level `export const cache`\n- [ ] **T6 (P1, human: ~1 day / CC: ~20 min)** — regression — Replay the T1 fixtures against the new `AuthBroker` path and add 3 HTTP-level E2E flows (valid → handler; revoked → today's status; suspended tenant → today's status); then retire `legacyAuthFlow()`\n  - Surfaced by: Test review T1 CRITICAL (D9); Architecture A3 mid-flight suspension\n  - Files: `auth/AuthBroker.regression.test.ts`, E2E spec, `auth/legacyAuthFlow.ts`\n  - Verify: every fixture byte-identical; 3 E2E green; `legacyAuthFlow()` has no remaining callers\n- [ ] **T7 (P2, human: ~1h / CC: ~5 min)** — plan hygiene — Remove `AuthCache` and `TokenStore` from any scaffolding, docs or file lists; confirm final touched-file count (~8)\n  - Surfaced by: Scope Challenge S4 `PLAN.md:43`, S5 `PLAN.md:19-20` (D5, D6)\n  - Files: plan/docs, any stubs created\n  - Verify: grep for `AuthCache|TokenStore|RequestPolicy` returns nothing outside history\n- [ ] **T8 (P2, human: ~1h / CC: ~5 min)** — diagrams — Add the pipeline diagram comment to `AuthBroker`, the fan-in comment to the composition root; update any existing ASCII diagrams in touched files\n  - Surfaced by: Architecture A4; Code quality (existing diagrams unknown, no source in repo)\n  - Files: `auth/AuthBroker.ts`, bootstrap module, any touched file with a diagram\n  - Verify: diagrams match the shipped code in the same commit\n- [ ] **T9 (P3, human: ~15 min / CC: ~2 min)** — TODOS.md — Create `TODOS.md` with the two accepted TODOs below (after plan mode exits)\n  - Surfaced by: Final planning decisions D10, D11\n  - Files: `TODOS.md`\n  - Verify: both entries present with What/Why/Pros/Cons/Context/Depends-on\n\n_No new tasks from Performance review beyond the deferred TODOs._\n\n## Accepted TODOs (not persisted — TODOS.md is outside the plan-mode write allowance; paste after exit)\n\n### TODO 1: Parallelize the 5 IDP validation calls (deferred from this refactor)\n* **What:** Parallelize the 5 independent IDP validation calls in `AuthBroker.fetchClaims` (Promise.all if all are required, allSettled if partial results are usable).\n* **Why:** Up to ~5x lower token-validation latency on cache miss; every cold-cache authenticated request pays this today.\n* **Pros:** One-file change once the pipeline is linear (D8); R6 fixtures already pin today's outcomes; only new tests are error ordering and burst behavior.\n* **Cons:** Changes which error surfaces first; 5x burst to the IDP per validation; needs rate-limit headroom and p50/p95 before/after numbers.\n* **Context:** Deferred by D4 in the 2026-09-16 eng review so a regression in the refactor stays attributable. Start in `AuthBroker.fetchClaims`; reuse `auth/__fixtures__/legacy-auth-flow.json`; add a fail-fast ordering test.\n* **Depends on / blocked by:** This refactor merged with R6 fixtures green.\n\n### TODO 2: Verify whether a cache hit short-circuits the 5 IDP calls\n* **What:** Read the recorded IDP call sequence for the \"valid token, cache hit\" fixture. If it shows 5 calls, open a follow-up PR adding short-circuit-on-hit with latency numbers and a revocation-freshness test.\n* **Why:** If the cache does not short-circuit, this is a larger latency win than parallelization.\n* **Pros:** Two-minute check; fixtures answer it for free; clear go/no-go.\n* **Cons:** Medium confidence (5/10) that it is an issue at all; short-circuiting changes revocation freshness and needs its own test.\n* **Context:** Raised as Performance P2 in the 2026-09-16 eng review. Behavior change, so never bundled into the refactor PR.\n* **Depends on / blocked by:** R6 fixtures recorded (T1).\n\n## Review findings by section\n\n**Step 0 Scope Challenge** (scope reduced per recommendation)\n| # | Sev | Conf | Source | Finding | Disposition |\n|---|---|---|---|---|---|\n| S1 | P1 | 9/10 | `PLAN.md:27-28` | Global mutable cache via module-level export, two writers | accepted → D7 |\n| S2 | P1 | 9/10 | `PLAN.md:35-36`, `:22-24` | Rewrite with no regression proof of the plan's own goal | accepted → D9 |\n| S3 | P2 | 8/10 | `PLAN.md:39-40` | Promise.all is a behavior change, not a refactor | deferred → D4 |\n| S4 | P2 | 8/10 | `PLAN.md:43` | TokenStore named, never described | cut → D5 |\n| S5 | P2 | 7/10 | `PLAN.md:19-20` | AuthCache facade adds no behavior | dropped → D6 |\n| S6 | P2 | 7/10 | `PLAN.md:8-12` | Stateless RequestPolicy is a function, not a class | accepted → D6 |\n| S7 | P2 | 8/10 | `PLAN.md:31-32` | Nested error-swallowing try/catch, no remedy proposed | accepted → D8 |\n| S8 | P2 | 9/10 | `PLAN.md:43-44` | 12 files / 5 classes complexity gate | resolved → D4-D6 (~8 files, 2 classes + 1 fn) |\n\n**Section 1 Architecture** — 4 issues\n- A1 [P1] (9/10) `PLAN.md:27-28` hidden shared mutable dependency → approved D7 (constructor injection, single instance at composition root).\n- A2 [P2] (6/10, medium confidence, verify) `PLAN.md:18` two writers, write ownership unstated → recorded assumption: SessionMint writes on mint, AuthBroker evicts on validation failure; verify during T3/T4.\n- A3 [P2] (8/10) suspension hook mid-flight has no named expected behavior → folded into D9 matrix.\n- A4 [P3] (9/10) no data-flow diagram in plan → added above (factual).\n\n**Section 2 Code quality** — 3 issues\n- C1 [P1] (8/10) `PLAN.md:31-32` three nested swallowing catches → approved D8 (linear pipeline, error map, log per path, unknown rethrows).\n- C2 [P2] (7/10) `PLAN.md:11` decideAccess purity needs proof → required proof of D6, carried to tests.\n- C3 [P3] (9/10) 60-line function named but unaddressed → folded into C1.\n\n**Section 3 Tests** — diagram produced, 22 gaps on planned paths (3 findings)\n- T1 [P1 CRITICAL] (9/10) `PLAN.md:35-36` no regression coverage → approved D9.\n- T2 [P2] (9/10) required proof of D6/D7/D8 contracts → carried, no question.\n- T3 [P2] (7/10) mid-flight suspension flow → folded into D9.\n\n**Section 4 Performance** — 2 issues\n- P1 [P2] (8/10) `PLAN.md:39-40` sequential IDP calls → deferred per D4 (TODO 1).\n- P2 [P2] (5/10, medium confidence, verify) cache-hit short-circuit unstated → assumption; TODO 2.\n\n**Outside Voice** — disabled (`codex_reviews=disabled`); no native replacement dispatched; recorded as `outside_status: disabled`.\n\n### Suppressed findings (appendix, confidence ≤ 4)\n- [P2] (4/10) Possible duplicated cache-key construction across AuthBroker and SessionMint. Cannot quote motivating code; `PLAN.md:15` says the adapter keys entries, which makes duplication unlikely. Check during T3/T4.\n- [P3] (3/10) Concurrent cache-miss requests for the same tenant may each hit the IDP (no dedupe). Not stated in the plan; behavior preserved either way this PR. Captured as a fixture row for observation only.\n\n## Decision ledger\n\nNumbering: D1 (CLAUDE.md routing rules, setup, answered A; edit and commit deferred until plan mode exits), D2 (skip /office-hours), D3 (cross-project learnings enabled) were setup questions and approve no engineering remedy. D10, D11 are TODO dispositions (both \"Add to TODOS.md\"). Findings S1-S8 are the Scope Challenge findings; A/C/T/P prefixes are Sections 1-4.\n\n### R1: Promise.all parallelization of the 5 IDP calls — in this PR or deferred\nFinding: S3, P2, confidence 8/10, PLAN.md:39-40 (\"parallelized via Promise.all trivially (calls are independent)\"), reviewer: Claude (plan-eng-review)\nPlan baseline: original proposal — parallelize in this refactor\nRuntime evidence: unknown; no source in repo. Plan asserts 5 sequential calls today. Fail-fast/burst semantics of Promise.all are documented behavior (MDN).\nState: approved\nComparison grid (scope selector; no pre-answer grid required):\n| Choice | Current | A | B |\n|---|---|---|---|\n| R1 parallelization | in this PR | defer to follow-up PR with own latency numbers and error-ordering test | keep in this PR |\nQuestion D4: Defer the Promise.all IDP parallelization out of this refactor? Recommendation: A.\nHeader: Scope\nOptions:\nA) Defer to a follow-up PR (recommended)\nB) Keep it in this PR\nActual answer: A — D4 answer \"Defer to a follow-up PR (recommended)\"\nAccepted scope: Remove parallelization from this plan. Record it under NOT in scope as a follow-up PR that must ship with (a) before/after p50/p95 validation latency, (b) a test for fail-fast error ordering, (c) a check of IDP rate-limit headroom at 5x burst. Completeness of chosen option: 10/10.\nHistory: none\n\n### R2: TokenStore — undescribed class\nFinding: S4, P2, confidence 8/10, PLAN.md:43 (\"TokenStore\" appears only in the class list), reviewer: Claude\nPlan baseline: original proposal — 5th new class, no description\nRuntime evidence: unknown; the plan's Existing contracts (PLAN.md:15-21) already assign token keying, eviction and invalidation to the unchanged adapter.\nState: approved\nComparison grid (scope selector):\n| Choice | Current | A | B | C |\n|---|---|---|---|---|\n| R2 TokenStore | listed, undescribed | cut from plan | keep, require written responsibility before build | keep as-is |\nQuestion D5: What happens to TokenStore, the class the plan names but never describes? Recommendation: A.\nHeader: Scope\nOptions:\nA) Cut TokenStore from this plan (recommended)\nB) Keep, but require a written responsibility before build\nC) Keep as-is\nActual answer: A — D5 answer \"Cut TokenStore from this plan (recommended)\"\nAccepted scope: TokenStore removed from the class list and file count. Token persistence stays with the existing adapter. If a real responsibility surfaces, it is re-proposed with a written contract (NOT in scope).\nHistory: none\n\n### R3: Class arrangement\nFinding: S5 (P2, 7/10, PLAN.md:19-20 facade) + S6 (P2, 7/10, PLAN.md:8-12 stateless policy) + S8 (P2, 9/10, PLAN.md:43-44 12 files / 5 classes), reviewer: Claude\nPlan baseline: original proposal — AuthBroker, SessionMint, AuthCache, RequestPolicy (TokenStore already cut per R2)\nRuntime evidence: unknown; plan text states RequestPolicy has no state and AuthCache adds no behavior over the adapter.\nState: approved\nComparison grid (scope selector; feature set fixed by R1/R2 in all options):\n| Choice | Current | A | B | C |\n|---|---|---|---|---|\n| R3 arrangement | 4 classes, ~11 files | AuthBroker + SessionMint classes; `decideAccess(claims, ctx)` pure function module; no AuthCache facade; ~8 files | keep 4 classes, ~11 files | single AuthService, ~6 files |\n| R1 | deferred (D4) | deferred | deferred | deferred |\n| R2 | cut (D5) | cut | cut | cut |\n| R4 cache wiring | module-level export, pending | pending | pending | pending |\n| R5 error handling in validateAndDispatch | swallowed, pending | pending | pending | pending |\nQuestion D6: Class arrangement: keep the four remaining classes, or collapse to two classes plus a function? Recommendation: A (listed first).\nHeader: Structure\nOptions:\nA) AuthBroker + SessionMint classes, RequestPolicy as a pure function, no AuthCache facade (recommended)\nB) Keep four classes: AuthBroker, SessionMint, AuthCache, RequestPolicy\nC) Single AuthService class (broker + mint + policy in one)\nActual answer: A — D6 answer \"AuthBroker + SessionMint classes, RequestPolicy as a pure function, no AuthCache facade (recommended)\"\nAccepted scope: Structure only. New code: `AuthBroker` class, `SessionMint` class, `decideAccess(claims, ctx): AccessDecision` pure function module (replaces RequestPolicy class). AuthCache facade dropped; both services depend on the existing cache adapter type directly. Wiring (R4) and error handling (R5) decided separately below.\nHistory: none\n\n### R4: How AuthBroker and SessionMint obtain the cache adapter\nFinding: S1 / A1, P1, confidence 9/10, PLAN.md:27-28 (\"share a global mutable `AuthCache` instance via module-level export. Both services mutate it.\"), reviewer: Claude\nPlan baseline: original proposal — module-level exported mutable singleton, shared by both services (with R3 approved, the shared object is the existing adapter instance rather than an AuthCache facade)\nRuntime evidence: unknown; no source in repo. Pattern risk is documented (hidden dependency, test isolation across Jest workers, no way to substitute a fake). Whether the adapter itself is safe under two concurrent writers is unverified; plan says its validity rules \"do not serialize mutations\" (PLAN.md:18).\nState: approved\nComparison grid:\n| Choice | Current | A | B | C |\n|---|---|---|---|---|\n| R4 cache wiring | module-level export of one mutable instance, imported by both services | constructor injection: `new AuthBroker({ cache, idp, clock })`, `new SessionMint({ cache, ... })`; one composition root creates the single adapter instance and passes it to both | keep module-level export as proposed | module-level export plus an exported `__resetCacheForTests()` hook |\n| Single backing cache | one instance | one instance (created once at the composition root) | one instance | one instance |\n| Test isolation | new module graph per test file only | any test constructs services with a fake or fresh adapter | relies on module cache resets / jest.resetModules | explicit reset between tests |\n| R3 arrangement | approved A (D6) | fixed | fixed | fixed |\n| R1 / R2 | deferred / cut | fixed | fixed | fixed |\n| R5 error handling | pending | pending | pending | pending |\n| R6 legacyAuthFlow regression contract | pending | pending | pending | pending |\nQuestion D7: How should AuthBroker and SessionMint get the shared cache adapter? Recommendation: A (constructor injection, Layer 1, no runtime behavior change). Completeness: A=10/10, B=3/10, C=6/10.\nHeader: Wiring\nOptions:\nA) Constructor injection of the adapter; one instance created at the composition root (recommended)\n✅ Every test can build AuthBroker or SessionMint with a fresh or fake adapter; no cross-test leakage. ✅ Ownership is visible at the call site: whoever constructs the services decides which cache they share. ❌ Adds a composition-root wiring step and constructor parameters to two classes (human: ~2h / CC: ~10 min).\nB) Keep the module-level exported singleton as proposed\n✅ Zero wiring code; import and use, exactly as the plan describes. ✅ Matches how a lot of small Node codebases already do it, so it is familiar. ❌ Tests depend on module-cache resets to isolate state; two services mutating a hidden global is the pattern the search check flagged as the classic footgun.\nC) Module-level singleton plus a `__resetCacheForTests()` escape hatch\n✅ Keeps the import-and-use convenience for production code. ✅ Gives tests a way to clear state between cases without module resets. ❌ Ships test-only mutation hooks in production code and still hides the dependency; a forgotten reset produces the same order-dependent test failures.\nActual answer: A — D7 answer \"Constructor injection of the adapter; one instance created at the composition root (recommended)\"\nAccepted scope: `AuthBroker` and `SessionMint` take the existing cache adapter (and IDP client, clock, logger) via constructor. One composition root (the existing app bootstrap module) creates the single adapter instance and passes it to both. No module-level exported cache instance. Tests construct services with a fresh or fake adapter. Required proof: a unit test per service that constructs it with a fake adapter and asserts no other cache is touched; a composition-root test that asserts both services receive the same instance. Completeness of chosen option: 10/10.\nHistory: none\n\n### R5: Error handling inside validateAndDispatch()\nFinding: S7 / C1, P1, confidence 8/10, PLAN.md:31-32 (\"The `validateAndDispatch()` function is 60 lines with three nested try/catch blocks; each catch swallows a different error class.\"), reviewer: Claude\nPlan baseline: original proposal — describes the nested/swallowing structure, proposes no change\nRuntime evidence: unknown; no source in repo. What each swallowed path returns today (deny? generic 500? fall-through to dispatch?) is unverified and is pinned by the R6 regression contract before any restructuring.\nState: approved\nComparison grid:\n| Choice | Current | A | B | C |\n|---|---|---|---|---|\n| R5 control flow | 3 nested try/catch, each swallowing one error class | one linear pipeline of named steps (fetchClaims → lookupCache → decideAccess → dispatch) with a single catch that maps each known error class to the same observable outcome it produces today | keep nesting; add a structured log line in each catch | leave as-is |\n| Observable outcome per error class | as today (unverified) | identical to today, pinned by R6 tests | identical to today | identical to today |\n| Silent failure paths | 3 | 0: every mapped error emits one structured log/metric; unknown errors rethrow | 0: logged, still swallowed | 3 |\n| Function length | 60 lines | ~20 lines + 4 helpers | ~66 lines | 60 lines |\n| R3 / R4 | approved (D6 / D7) | fixed | fixed | fixed |\n| R6 regression contract | pending | pending | pending | pending |\nQuestion D8: What happens to the three nested, error-swallowing try/catch blocks in validateAndDispatch()? Recommendation: A. Completeness: A=10/10, B=6/10, C=2/10.\nHeader: Errors\nOptions:\nA) Flatten to a linear pipeline with one error-to-outcome map; log every formerly silent path (recommended)\n✅ Each step (fetch claims, cache lookup, decide, dispatch) becomes a named, individually testable helper. ✅ Zero silent failures: every known error class produces today's outcome plus one structured log; unknown errors surface instead of being swallowed. ❌ Largest diff in this file; requires the R6 regression fixtures first so each error class's current outcome is known before it is mapped (human: ~1 day / CC: ~20 min).\nB) Keep the nested structure, add a structured log line inside each catch\n✅ Smallest code change; no risk of altering control flow. ✅ Removes the silent-failure problem for operators at 3am. ❌ Leaves a 60-line, three-deep function as the heart of a freshly reorganized module; the next error class becomes a fourth nested block.\nC) Leave as-is\n✅ No diff, no risk, no test work in this function. ✅ Consistent with a strict \"move only\" reading of the plan. ❌ The plan's own Code quality section names this as the problem and then ships it untouched; three silent failure paths stay in the auth decision.\nActual answer: A — D8 answer \"Flatten to a linear pipeline with one error-to-outcome map; log every formerly silent path (recommended)\"\nAccepted scope: `validateAndDispatch()` becomes a linear pipeline: `fetchClaims` → `lookupCache` → `decideAccess` → `dispatch`, each a named helper. One `catch` maps each known error class to the exact observable outcome it produces today (pinned by R6 fixtures before the rewrite) and emits one structured log/metric per formerly silent path; unknown errors rethrow. Ordering constraint: R6 characterization fixtures land before this rewrite. Intentional difference vs today: additive structured logging only. Required proof: one unit test per error class asserting outcome + log emission; one test asserting an unknown error propagates. Completeness of chosen option: 10/10.\nHistory: none\n\n### R6: Regression contract for legacyAuthFlow() rewrite (REGRESSION RULE)\nFinding: S2 / T1, P1 CRITICAL, confidence 9/10, PLAN.md:35-36 (\"The existing `legacyAuthFlow()` will get rewritten as part of this work; no regression test for the prior behavior is planned.\") and PLAN.md:22-24 (\"That coverage does not exercise legacyAuthFlow() or assert compatibility with its prior behavior.\"), reviewer: Claude\nPlan baseline: original proposal — no regression coverage; unit/integration tests for new components only\nRuntime evidence: unknown; no source or tests in repo. Existing adapter tests remain (PLAN.md:20-21) but cover the adapter, not the orchestration.\nState: approved\nComparison grid:\n| Choice | Current | A | B | C |\n|---|---|---|---|---|\n| R6 behavior to preserve | unstated | full matrix: allow/deny outcome, status code, response shape, cache side effects and IDP call sequence for every input class below | happy path + one deny | none stated |\n| Input classes covered | none | valid token cache-miss; valid token cache-hit; expired token; revoked token; tenant suspended; wrong issuer; wrong audience; policy-version mismatch; policy deny; IDP timeout at call k (k=1..5); IDP 5xx at call k; malformed token; missing token; suspension hook firing mid-flight (A3) | valid token; policy deny | none |\n| Intentional differences | unstated | additive structured logging only (D8); everything else byte-identical | same | n/a |\n| Acceptance assertions | none | characterization fixtures recorded from legacyAuthFlow() BEFORE the rewrite; same fixtures run against the new path; both must match; plus one HTTP-level E2E through the real entry point for the auth/deny/suspended paths [→E2E] | assertions written from memory of expected behavior | n/a |\n| Test level | n/a | unit (fixtures) + E2E (3 flows) | integration only | unit on new components only (plan's current) |\n| R3 / R4 / R5 | approved (D6 / D7 / D8) | fixed | fixed | fixed |\nQuestion D9: How do we prove the rewritten auth flow behaves exactly like legacyAuthFlow() does today? Recommendation: A. Completeness: A=10/10, B=5/10, C=2/10.\nHeader: Regression\nOptions:\nA) Full characterization matrix recorded before the rewrite, plus 3 HTTP-level E2E flows (recommended)\n✅ Every error class the D8 pipeline maps has a pinned expected outcome before it is mapped; the rewrite cannot silently change a deny into an allow. ✅ Fixtures double as the spec for the new code and as the regression suite for the deferred Promise.all PR. ❌ Requires recording fixtures against the current code first, which sequences this work before any rewrite lands.\nB) Integration tests for the happy path and one policy-deny path\n✅ Cheap and quick; catches gross breakage of the main flow. ✅ No fixture-recording step. ❌ Leaves revocation, suspension, expiry and every IDP failure path unpinned, which is exactly where auth regressions hide.\nC) Unit tests on the new components only (the plan as written)\n✅ Already planned; zero additional work. ✅ Good coverage of the new code's own branches. ❌ Proves the new code does what the new code does; proves nothing about equivalence with legacyAuthFlow(), so the plan's goal stays unverified.\nActual answer: A — D9 answer \"Full characterization matrix recorded before the rewrite, plus 3 HTTP-level E2E flows (recommended)\"\nAccepted scope: Regression contract for legacyAuthFlow(). Behavior to preserve: allow/deny outcome, HTTP status, response shape, cache side effects (writes/evictions) and IDP call sequence for every input class in the grid. Intentional differences: additive structured logging only (D8). Acceptance: characterization fixtures recorded from legacyAuthFlow() BEFORE any rewrite (`auth/__fixtures__/legacy-auth-flow.json`), replayed against the new AuthBroker path in `auth/AuthBroker.regression.test.ts`; byte-identical outcome per fixture. Plus 3 HTTP-level E2E flows [→E2E]: valid token → handler runs; revoked token → today's status; suspended tenant → today's status. Ordering: fixtures land as the first commit of the branch. Completeness of chosen option: 10/10.\nHistory: none\n\nApproval readiness: PASS — R1 (D4/A), R2 (D5/A), R3 (D6/A), R4 (D7/A), R5 (D8/A), R6 (D9/A). TODO dispositions D10/A, D11/A. No pending remedies.\n\n## Unresolved decisions that may bite you later\n\nNone. All six remedy choices (R1-R6) and both TODO dispositions carry actual answers.\n\n## Completion summary\n\n- Step 0: Scope Challenge — scope reduced per recommendation (Promise.all deferred, TokenStore cut, 5 classes → 2 classes + 1 pure function, ~12 files → ~8)\n- Architecture Review: 4 issues found\n- Code Quality Review: 3 issues found\n- Test Review: diagram produced, 22 gaps identified (3 findings; all planned paths, 4 E2E-worthy)\n- Performance Review: 2 issues found\n- NOT in scope: written\n- What already exists: written\n- TODOS.md updates: 2 items proposed to user (both accepted; not persisted until plan mode exits)\n- Failure modes: 0 critical gaps flagged\n- Unresolved decisions: 0 in this review\n- Outside voice: codex, disabled (`codex_reviews=disabled`); no native replacement\n- Parallelization: 3 lanes, 2 parallel / 1 sequential\n- Lake Score: 4/4 (D4, D7, D8, D9 all chose 10/10; D5, D6, D10, D11 differ in kind)\n\n## GSTACK REVIEW REPORT\n\n| Review | Trigger | Why | Runs | Status | Findings |\n|--------|---------|-----|------|--------|----------|\n| CEO Review | `/plan-ceo-review` | Scope & strategy | 0 | — | — |\n| Outside Review | codex via `/plan-eng-review` | Independent 2nd opinion | 1 | disabled | none (skipped: codex_reviews disabled) |\n| Eng Review | `/plan-eng-review` | Architecture & tests (required) | 1 | CLEAR | 31 issues (22 are test-coverage gaps on planned paths), 0 critical gaps |\n| Design Review | `/plan-design-review` | UI/UX gaps | 0 | — | — |\n| DX Review | `/plan-devex-review` | Developer experience gaps | 0 | — | — |\n\n- **OUTSIDE COVERAGE:** provider codex, phase plan-review, disabled by config (`codex_reviews=disabled`), no findings, no native replacement dispatched.\n- **VERDICT:** ENG CLEARED — ready to implement (scope reduced per D4/D5/D6; regression contract D9 is the first commit).\n\nNO UNRESOLVED DECISIONS\n",
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          "questions": [
            {
              "question": "D1 — Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: main branch of the plan-review fixture repo, about to review PLAN.md.\nELI10: gstack has a bunch of slash-command skills (review, ship, investigate). A short routing table in CLAUDE.md tells Claude which one to reach for when you say things like \"review this\" or \"ship it\", so you do not have to remember skill names. Without it, you invoke skills by hand.\nStakes if we pick wrong: Nothing breaks either way; the only cost is a few extra keystrokes per session if skipped, or a small CLAUDE.md edit plus commit if added.\nRecommendation: A because the table is cheap, revertable, and makes the rest of the gstack skills discoverable. Note: plan mode is active, so the actual edit and commit would run after this review finishes and plan mode exits.\nNote: options differ in kind, not coverage — no completeness score.\nNet: convenience of auto-routing vs keeping CLAUDE.md untouched.",
              "header": "Routing",
              "multiSelect": false,
              "options": [
                {
                  "label": "Add routing rules to CLAUDE.md (recommended)",
                  "description": "✅ Skills get invoked automatically when a request matches (\"review this\" → /review). ✅ One-time, one-file change that is trivially revertable via git. ❌ Adds ~20 lines to CLAUDE.md and requires a commit (deferred until plan mode exits)."
                },
                {
                  "label": "No thanks, I'll invoke skills manually",
                  "description": "✅ CLAUDE.md stays exactly as the fixture author wrote it, no extra commit. ✅ Full control over when each skill runs. ❌ You must remember and type skill names yourself; the offer will not repeat for this project."
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          "answers": {
            "D1 — Add gstack skill routing rules to this project's CLAUDE.md?\nProject/branch/task: main branch of the plan-review fixture repo, about to review PLAN.md.\nELI10: gstack has a bunch of slash-command skills (review, ship, investigate). A short routing table in CLAUDE.md tells Claude which one to reach for when you say things like \"review this\" or \"ship it\", so you do not have to remember skill names. Without it, you invoke skills by hand.\nStakes if we pick wrong: Nothing breaks either way; the only cost is a few extra keystrokes per session if skipped, or a small CLAUDE.md edit plus commit if added.\nRecommendation: A because the table is cheap, revertable, and makes the rest of the gstack skills discoverable. Note: plan mode is active, so the actual edit and commit would run after this review finishes and plan mode exits.\nNote: options differ in kind, not coverage — no completeness score.\nNet: convenience of auto-routing vs keeping CLAUDE.md untouched.": "Add routing rules to CLAUDE.md (recommended)"
          },
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              "question": "D2 — Run /office-hours first, or go straight into the standard eng review?\nProject/branch/task: main branch, reviewing PLAN.md (Multi-tenant Auth Refactor); no design doc found for this branch.\nELI10: A design doc is the \"why\" behind a plan: the problem statement, the premise challenge, and the alternatives that were considered and rejected. /office-hours produces one in about 10 minutes. This plan currently has a two-sentence context paragraph and no alternatives, so the review will have to infer intent (for example, why five classes instead of two) rather than check it against stated reasoning.\nStakes if we pick wrong: Skipping means some findings will be \"is this intentional?\" instead of \"this contradicts your own stated constraint\"; running it costs ~10 minutes before the review starts.\nRecommendation: B because the plan author already supplied a Context section with the key constraint (no product-behavior change), which is enough for the review to hold the plan accountable to; the eng review can flag the missing-alternatives gap itself.\nNote: options differ in kind, not coverage — no completeness score.\nNet: sharper input up front vs getting to the architecture findings now.",
              "header": "Prereq",
              "multiSelect": false,
              "options": [
                {
                  "label": "Skip — proceed with standard review (recommended)",
                  "description": "✅ Review starts immediately; the plan's Context section already states the governing constraint (behavior-preserving refactor). ✅ Missing alternatives get flagged as a finding rather than blocking the review. ❌ Recommendations on class boundaries lean on inference about author intent instead of a written premise."
                },
                {
                  "label": "Run /office-hours now, then review",
                  "description": "✅ Produces a structured problem statement and explored alternatives the review can check the plan against. ✅ Surfaces whether the five-class split was a deliberate choice or accidental accretion. ❌ Roughly 10 extra minutes of Q&A before any architecture findings appear (human: ~10 min / CC: ~10 min, it is interactive either way)."
                }
              ]
            },
            {
              "question": "D3 — Let gstack search learnings from your other projects on this machine?\nProject/branch/task: main branch, one-time gstack setup that applies to this and future reviews here.\nELI10: gstack saves small \"lessons learned\" per project (pitfalls, patterns). Cross-project mode lets this review also look at lessons saved from your other repos on this machine. Nothing leaves the machine. It helps solo developers whose projects share conventions; it is a concern if you work on multiple client codebases where hints from one should never surface in another.\nStakes if we pick wrong: Enabling in a multi-client setup could surface one client's pattern while working on another; disabling just means fewer prior-learning hints.\nRecommendation: A because this is a single-developer sandbox with no sign of multi-client separation, and the data stays local.\nNote: options differ in kind, not coverage — no completeness score.\nNet: more prior-learning hints vs strict per-project isolation.",
              "header": "Learnings",
              "multiSelect": false,
              "options": [
                {
                  "label": "Enable cross-project learnings (recommended)",
                  "description": "✅ Reviews get hints from patterns already learned in your other local repos. ✅ Stays entirely on this machine; no network involved. ❌ In a multi-client setup, a hint from one codebase could appear while working in another."
                },
                {
                  "label": "Keep learnings project-scoped only",
                  "description": "✅ Strict isolation: each project only ever sees its own saved lessons. ✅ Safe default for consultants or multi-client work. ❌ This fresh project has zero learnings yet, so the review gets no prior-learning input at all."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D2 — Run /office-hours first, or go straight into the standard eng review?\nProject/branch/task: main branch, reviewing PLAN.md (Multi-tenant Auth Refactor); no design doc found for this branch.\nELI10: A design doc is the \"why\" behind a plan: the problem statement, the premise challenge, and the alternatives that were considered and rejected. /office-hours produces one in about 10 minutes. This plan currently has a two-sentence context paragraph and no alternatives, so the review will have to infer intent (for example, why five classes instead of two) rather than check it against stated reasoning.\nStakes if we pick wrong: Skipping means some findings will be \"is this intentional?\" instead of \"this contradicts your own stated constraint\"; running it costs ~10 minutes before the review starts.\nRecommendation: B because the plan author already supplied a Context section with the key constraint (no product-behavior change), which is enough for the review to hold the plan accountable to; the eng review can flag the missing-alternatives gap itself.\nNote: options differ in kind, not coverage — no completeness score.\nNet: sharper input up front vs getting to the architecture findings now.": "Skip — proceed with standard review (recommended)",
            "D3 — Let gstack search learnings from your other projects on this machine?\nProject/branch/task: main branch, one-time gstack setup that applies to this and future reviews here.\nELI10: gstack saves small \"lessons learned\" per project (pitfalls, patterns). Cross-project mode lets this review also look at lessons saved from your other repos on this machine. Nothing leaves the machine. It helps solo developers whose projects share conventions; it is a concern if you work on multiple client codebases where hints from one should never surface in another.\nStakes if we pick wrong: Enabling in a multi-client setup could surface one client's pattern while working on another; disabling just means fewer prior-learning hints.\nRecommendation: A because this is a single-developer sandbox with no sign of multi-client separation, and the data stays local.\nNote: options differ in kind, not coverage — no completeness score.\nNet: more prior-learning hints vs strict per-project isolation.": "Enable cross-project learnings (recommended)"
          },
          "unansweredQuestionIndices": [],
          "answeredAt": "2026-09-16T05:53:59.314Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "toolUseId": "toolu_01D697hbhx2vmFFkf6nCbz6r",
          "questions": [
            {
              "question": "D4 — Defer the Promise.all IDP parallelization out of this refactor?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, complexity gate: feature deferral 1 of 2.\nELI10: The plan's stated goal is to move code around without changing what users experience. Running the 5 identity-provider calls at once instead of one after another is a real speed win, but it is a behavior change: today, if call 1 fails, calls 2-5 never happen; with Promise.all all 5 fire, the provider sees a 5x burst per validation, and the error a user sees can come from a different call than before. Mixing that into the same PR as a 12-file reorganization means a regression could be either the move or the parallelization, and you cannot tell which.\nStakes if we pick wrong: Bundle it and a latency or error-ordering regression is undiagnosable against 12 changed files; defer it and users keep today's sequential latency for one more PR.\nRecommendation: A because the refactor lands with a clean \"same behavior\" oracle, and the parallelization ships right after as a 1-file change with its own before/after latency numbers and its own error-semantics test (human: ~1 day / CC: ~20 min, either way).\nCompleteness: A=10/10, B=7/10\nNet: diagnosability of the refactor vs shipping the speedup one PR sooner.",
              "header": "Scope",
              "multiSelect": false,
              "options": [
                {
                  "label": "Defer to a follow-up PR (recommended)",
                  "description": "✅ Refactor PR stays a pure move; legacyAuthFlow() regression tests prove equivalence with no confounding change. ✅ Follow-up PR carries its own latency measurement and a test for fail-fast error ordering and IDP rate-limit behavior. ❌ Users keep the current sequential validation latency for one more release cycle."
                },
                {
                  "label": "Keep it in this PR",
                  "description": "✅ One PR, one review, speedup lands sooner for every token validation. ✅ Author already believes the 5 calls are independent, so the code change is small. ❌ Any regression in auth latency or error messages now has 12 files plus a concurrency change as suspects; the plan's \"no behavior change\" claim becomes false and the regression tests have to encode the new error semantics instead of the old."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D4 — Defer the Promise.all IDP parallelization out of this refactor?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, complexity gate: feature deferral 1 of 2.\nELI10: The plan's stated goal is to move code around without changing what users experience. Running the 5 identity-provider calls at once instead of one after another is a real speed win, but it is a behavior change: today, if call 1 fails, calls 2-5 never happen; with Promise.all all 5 fire, the provider sees a 5x burst per validation, and the error a user sees can come from a different call than before. Mixing that into the same PR as a 12-file reorganization means a regression could be either the move or the parallelization, and you cannot tell which.\nStakes if we pick wrong: Bundle it and a latency or error-ordering regression is undiagnosable against 12 changed files; defer it and users keep today's sequential latency for one more PR.\nRecommendation: A because the refactor lands with a clean \"same behavior\" oracle, and the parallelization ships right after as a 1-file change with its own before/after latency numbers and its own error-semantics test (human: ~1 day / CC: ~20 min, either way).\nCompleteness: A=10/10, B=7/10\nNet: diagnosability of the refactor vs shipping the speedup one PR sooner.": "Defer to a follow-up PR (recommended)"
          },
          "unansweredQuestionIndices": [],
          "answeredAt": "2026-09-16T05:55:40.608Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "toolUseId": "toolu_01JQUm4vKZzA22rBF45g4HFH",
          "questions": [
            {
              "question": "D5 — What happens to TokenStore, the class the plan names but never describes?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, complexity gate: feature deferral 2 of 2 (D4 answered: Promise.all deferred).\nELI10: The plan lists five new classes. Four of them get at least a sentence about what they do. TokenStore appears only in the list on PLAN.md:43. The plan also says the existing cache adapter already keys, evicts, and invalidates tokens and stays in use unchanged. So either TokenStore duplicates the adapter, or it has a job nobody wrote down. Building an undescribed class in an auth path is how you get two sources of truth for \"is this token valid\".\nStakes if we pick wrong: Build it blind and you risk a second token cache that misses logout/revocation invalidation; cut it and, if it had a real job, that job resurfaces as a gap during implementation.\nRecommendation: A because the plan's own Existing Contracts section already covers token storage, eviction and invalidation via the adapter, and nothing in the plan needs a second store. If a real responsibility exists, the author adds it back with a written contract.\nNote: options differ in kind, not coverage — no completeness score.\nNet: fewer moving parts and one token source of truth vs preserving a slot for an unstated need.",
              "header": "Scope",
              "multiSelect": false,
              "options": [
                {
                  "label": "Cut TokenStore from this plan (recommended)",
                  "description": "✅ Token persistence, eviction and invalidation stay with the one existing adapter that already has tests and hooks. ✅ Class count drops to four before the structure question; one less file in the 12. ❌ If the author had an unstated responsibility in mind (for example refresh-token rotation), it must be re-proposed with a written contract before it can be built."
                },
                {
                  "label": "Keep, but require a written responsibility before build",
                  "description": "✅ Preserves the author's intent slot without building on a guess. ✅ Forces the missing sentence into the plan, which is cheap. ❌ The plan stays at five classes for the structure question and the review cannot check TokenStore's boundary against the adapter it may overlap."
                },
                {
                  "label": "Keep as-is",
                  "description": "✅ No change to the author's list; implementation decides its shape. ✅ Zero planning overhead now. ❌ An undescribed class next to an existing token cache is the most likely place for a second validity source that misses revocation; nothing in the plan lets a reviewer check that."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D5 — What happens to TokenStore, the class the plan names but never describes?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, complexity gate: feature deferral 2 of 2 (D4 answered: Promise.all deferred).\nELI10: The plan lists five new classes. Four of them get at least a sentence about what they do. TokenStore appears only in the list on PLAN.md:43. The plan also says the existing cache adapter already keys, evicts, and invalidates tokens and stays in use unchanged. So either TokenStore duplicates the adapter, or it has a job nobody wrote down. Building an undescribed class in an auth path is how you get two sources of truth for \"is this token valid\".\nStakes if we pick wrong: Build it blind and you risk a second token cache that misses logout/revocation invalidation; cut it and, if it had a real job, that job resurfaces as a gap during implementation.\nRecommendation: A because the plan's own Existing Contracts section already covers token storage, eviction and invalidation via the adapter, and nothing in the plan needs a second store. If a real responsibility exists, the author adds it back with a written contract.\nNote: options differ in kind, not coverage — no completeness score.\nNet: fewer moving parts and one token source of truth vs preserving a slot for an unstated need.": "Cut TokenStore from this plan (recommended)"
          },
          "unansweredQuestionIndices": [],
          "answeredAt": "2026-09-16T05:55:58.687Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "toolUseId": "toolu_01Bdvqnvnqn2M6TsnnVdM3ra",
          "questions": [
            {
              "question": "D6 — Class arrangement: keep the four remaining classes, or collapse to two classes plus a function?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, complexity gate: structure (feature set fixed: Promise.all deferred per D4, TokenStore cut per D5).\nELI10: After D4/D5 the plan still adds AuthBroker, SessionMint, AuthCache and RequestPolicy across roughly 11 files. By the plan's own description, RequestPolicy is stateless (claims + context in, allow/deny out) and AuthCache is a pass-through facade over an adapter that already exists and stays unchanged. A class with no state is a function wearing a costume; a facade with no new behavior is a second name for the same thing. Fewer names means a reviewer can hold the whole auth path in their head at 3am. This question picks structure only: how the services get their cache dependency (the shared-singleton finding S1) and how errors are handled are asked separately.\nStakes if we pick wrong: Too many layers and every future auth change touches four files to move one decision; too few and broker and mint logic tangle into one 300-line service that is hard to test independently.\nRecommendation: B because it removes the two boundaries the plan itself cannot justify (stateless policy, behaviorless facade) while keeping the one boundary that carries real separation of concerns (validate/dispatch vs session minting). Roughly 8 files instead of 12.\nNote: options differ in kind, not coverage — no completeness score.\nNet: fewer moving parts and one less indirection on every cache call vs preserving named seams for future growth.",
              "header": "Structure",
              "multiSelect": false,
              "options": [
                {
                  "label": "AuthBroker + SessionMint classes, RequestPolicy as a pure function, no AuthCache facade (recommended)",
                  "description": "✅ Two classes with real state/lifecycle; access decision becomes a pure decideAccess(claims, ctx) module that is trivially unit-tested with a table of cases. ✅ Services depend on the existing tested adapter directly; no facade to keep in sync, ~8 files touched (human: ~3 days / CC: ~40 min). ❌ If tenant-specific policy variants arrive later, a function module needs to grow into a strategy shape then; a class would have had the slot ready."
                },
                {
                  "label": "Keep four classes: AuthBroker, SessionMint, AuthCache, RequestPolicy",
                  "description": "✅ Matches the author's original decomposition minus the cut TokenStore; each concept has a named home. ✅ AuthCache gives a single seam to add service-facing behavior later (metrics, tracing). ❌ Two of the four classes add no behavior today per PLAN.md:8-12 and :19-20; ~11 files touched and every cache call goes through an extra hop that has to be tested and mocked (human: ~4 days / CC: ~55 min)."
                },
                {
                  "label": "Single AuthService class (broker + mint + policy in one)",
                  "description": "✅ Smallest file count (~6) and one entry point to read. ✅ No inter-class contracts to define or mock. ❌ Session minting and request validation have different lifecycles and failure modes; fusing them recreates the 60-line nested try/catch problem at class scale and makes independent testing of minting harder (human: ~2.5 days / CC: ~35 min)."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D6 — Class arrangement: keep the four remaining classes, or collapse to two classes plus a function?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, complexity gate: structure (feature set fixed: Promise.all deferred per D4, TokenStore cut per D5).\nELI10: After D4/D5 the plan still adds AuthBroker, SessionMint, AuthCache and RequestPolicy across roughly 11 files. By the plan's own description, RequestPolicy is stateless (claims + context in, allow/deny out) and AuthCache is a pass-through facade over an adapter that already exists and stays unchanged. A class with no state is a function wearing a costume; a facade with no new behavior is a second name for the same thing. Fewer names means a reviewer can hold the whole auth path in their head at 3am. This question picks structure only: how the services get their cache dependency (the shared-singleton finding S1) and how errors are handled are asked separately.\nStakes if we pick wrong: Too many layers and every future auth change touches four files to move one decision; too few and broker and mint logic tangle into one 300-line service that is hard to test independently.\nRecommendation: B because it removes the two boundaries the plan itself cannot justify (stateless policy, behaviorless facade) while keeping the one boundary that carries real separation of concerns (validate/dispatch vs session minting). Roughly 8 files instead of 12.\nNote: options differ in kind, not coverage — no completeness score.\nNet: fewer moving parts and one less indirection on every cache call vs preserving named seams for future growth.": "AuthBroker + SessionMint classes, RequestPolicy as a pure function, no AuthCache facade (recommended)"
          },
          "unansweredQuestionIndices": [],
          "answeredAt": "2026-09-16T05:56:24.755Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "toolUseId": "toolu_01HUjzQNskKNGDXoXHo76kWr",
          "questions": [
            {
              "question": "D7 — How should AuthBroker and SessionMint get the shared cache adapter?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, Section 1 Architecture (structure fixed per D6; scope per D4/D5).\nELI10: The plan has both new services grab one shared cache object from a module-level export, and both write to it. That works until you need to test one service alone, run two tenants' worth of tests in one process, or swap the cache for a fake: the dependency is invisible, so every test inherits whatever the last test left in the cache. Passing the cache in through the constructor makes the dependency visible, keeps exactly one real instance in production (the place that builds the app creates it once), and lets any test hand in a fresh or fake cache. Same runtime behavior, different wiring.\nStakes if we pick wrong: Hidden shared state in the auth path means flaky tests that pass alone and fail together, and a production incident where nobody can tell which service wrote the stale entry.\nRecommendation: A because it is the boring, proven fix (constructor injection, Layer 1) with no runtime behavior change, and it is the only option where the regression tests in Section 3 can run against an isolated cache.\nCompleteness: A=10/10, B=3/10, C=6/10\nNet: visible dependency with a small wiring step vs convenience that costs test isolation in the one path where flaky tests are least acceptable.",
              "header": "Wiring",
              "multiSelect": false,
              "options": [
                {
                  "label": "Constructor injection of the adapter; one instance created at the composition root (recommended)",
                  "description": "✅ Every test can build AuthBroker or SessionMint with a fresh or fake adapter; no cross-test leakage. ✅ Ownership is visible at the call site: whoever constructs the services decides which cache they share. ❌ Adds a composition-root wiring step and constructor parameters to two classes (human: ~2h / CC: ~10 min)."
                },
                {
                  "label": "Keep the module-level exported singleton as proposed",
                  "description": "✅ Zero wiring code; import and use, exactly as the plan describes. ✅ Matches how a lot of small Node codebases already do it, so it is familiar. ❌ Tests depend on module-cache resets to isolate state; two services mutating a hidden global is the pattern the search check flagged as the classic footgun."
                },
                {
                  "label": "Module-level singleton plus a `__resetCacheForTests()` escape hatch",
                  "description": "✅ Keeps the import-and-use convenience for production code. ✅ Gives tests a way to clear state between cases without module resets. ❌ Ships test-only mutation hooks in production code and still hides the dependency; a forgotten reset produces the same order-dependent test failures."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D7 — How should AuthBroker and SessionMint get the shared cache adapter?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, Section 1 Architecture (structure fixed per D6; scope per D4/D5).\nELI10: The plan has both new services grab one shared cache object from a module-level export, and both write to it. That works until you need to test one service alone, run two tenants' worth of tests in one process, or swap the cache for a fake: the dependency is invisible, so every test inherits whatever the last test left in the cache. Passing the cache in through the constructor makes the dependency visible, keeps exactly one real instance in production (the place that builds the app creates it once), and lets any test hand in a fresh or fake cache. Same runtime behavior, different wiring.\nStakes if we pick wrong: Hidden shared state in the auth path means flaky tests that pass alone and fail together, and a production incident where nobody can tell which service wrote the stale entry.\nRecommendation: A because it is the boring, proven fix (constructor injection, Layer 1) with no runtime behavior change, and it is the only option where the regression tests in Section 3 can run against an isolated cache.\nCompleteness: A=10/10, B=3/10, C=6/10\nNet: visible dependency with a small wiring step vs convenience that costs test isolation in the one path where flaky tests are least acceptable.": "Constructor injection of the adapter; one instance created at the composition root (recommended)"
          },
          "unansweredQuestionIndices": [],
          "answeredAt": "2026-09-16T05:58:06.620Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "toolUseId": "toolu_01Kw2xtzS7a8VzFCZqhBUkmE",
          "questions": [
            {
              "question": "D8 — What happens to the three nested, error-swallowing try/catch blocks in validateAndDispatch()?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, Section 2 Code quality (structure per D6, wiring per D7).\nELI10: The function that decides whether a request gets in is 60 lines with three try/catch blocks nested inside each other, and each one catches a different kind of error and quietly moves on. In an auth path, \"quietly moves on\" is the scariest phrase there is: either the user gets a generic failure with nothing in the logs, or the code falls through and dispatches anyway. This is a refactor, so the user-visible result for each error must stay exactly what it is today; the question is whether the code stays shaped like that or becomes a straight line of named steps with one place that maps each error to its outcome and writes one log line.\nStakes if we pick wrong: Keep the nesting and the next engineer adds a fourth catch; flatten it carelessly and an error that used to deny now allows. The regression tests in Section 3 pin today's outcomes either way.\nRecommendation: A because the plan's stated purpose is reorganizing this orchestration, this function is the orchestration, and a linear pipeline with typed outcomes is the explicit-over-clever shape; the R6 regression tests make the behavior-preservation claim checkable.\nCompleteness: A=10/10, B=6/10, C=2/10\nNet: explicit pipeline plus visible failures at the cost of a bigger diff vs a minimal touch that leaves the structure the plan itself flagged.",
              "header": "Errors",
              "multiSelect": false,
              "options": [
                {
                  "label": "Flatten to a linear pipeline with one error-to-outcome map; log every formerly silent path (recommended)",
                  "description": "✅ Each step (fetch claims, cache lookup, decide, dispatch) becomes a named, individually testable helper. ✅ Zero silent failures: every known error class produces today's outcome plus one structured log; unknown errors surface instead of being swallowed. ❌ Largest diff in this file; requires the R6 regression fixtures first so each error class's current outcome is known before it is mapped (human: ~1 day / CC: ~20 min)."
                },
                {
                  "label": "Keep the nested structure, add a structured log line inside each catch",
                  "description": "✅ Smallest code change; no risk of altering control flow. ✅ Removes the silent-failure problem for operators at 3am. ❌ Leaves a 60-line, three-deep function as the heart of a freshly reorganized module; the next error class becomes a fourth nested block."
                },
                {
                  "label": "Leave as-is",
                  "description": "✅ No diff, no risk, no test work in this function. ✅ Consistent with a strict \"move only\" reading of the plan. ❌ The plan's own Code quality section names this as the problem and then ships it untouched; three silent failure paths stay in the auth decision."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D8 — What happens to the three nested, error-swallowing try/catch blocks in validateAndDispatch()?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, Section 2 Code quality (structure per D6, wiring per D7).\nELI10: The function that decides whether a request gets in is 60 lines with three try/catch blocks nested inside each other, and each one catches a different kind of error and quietly moves on. In an auth path, \"quietly moves on\" is the scariest phrase there is: either the user gets a generic failure with nothing in the logs, or the code falls through and dispatches anyway. This is a refactor, so the user-visible result for each error must stay exactly what it is today; the question is whether the code stays shaped like that or becomes a straight line of named steps with one place that maps each error to its outcome and writes one log line.\nStakes if we pick wrong: Keep the nesting and the next engineer adds a fourth catch; flatten it carelessly and an error that used to deny now allows. The regression tests in Section 3 pin today's outcomes either way.\nRecommendation: A because the plan's stated purpose is reorganizing this orchestration, this function is the orchestration, and a linear pipeline with typed outcomes is the explicit-over-clever shape; the R6 regression tests make the behavior-preservation claim checkable.\nCompleteness: A=10/10, B=6/10, C=2/10\nNet: explicit pipeline plus visible failures at the cost of a bigger diff vs a minimal touch that leaves the structure the plan itself flagged.": "Flatten to a linear pipeline with one error-to-outcome map; log every formerly silent path (recommended)"
          },
          "unansweredQuestionIndices": [],
          "answeredAt": "2026-09-16T05:59:20.429Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "toolUseId": "toolu_01HcXJ6Cx3iUfPgyqR8BgS63",
          "questions": [
            {
              "question": "D9 — How do we prove the rewritten auth flow behaves exactly like legacyAuthFlow() does today?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, Section 3 Test review, regression rule (structure D6, wiring D7, error pipeline D8 approved).\nELI10: The whole point of this plan is \"same behavior, better organized\". Right now it plans tests for the new pieces but nothing that compares the new path to the old one, so the only proof of \"same behavior\" would be users not complaining. A characterization test records what the old code does for every kind of input (good token, expired, revoked, suspended tenant, identity provider down on call 3, and so on) before anything is touched, then runs the same inputs through the new code and demands identical answers. This question settles what must stay identical, what is allowed to differ, and what the acceptance assertions are. Skipping is not an option under the regression rule; the choice is how deep.\nStakes if we pick wrong: Too shallow and a tenant-suspension or revocation path silently changes and someone stays logged in after being revoked; the full matrix costs an afternoon of fixture recording.\nRecommendation: A because the input classes are enumerable from the plan's own contracts (PLAN.md:15-17 lists them), recording fixtures against the old code is mechanical, and this is the only test that makes the plan's central claim checkable (human: ~2 days / CC: ~30 min).\nCompleteness: A=10/10, B=5/10, C=2/10\nNet: an afternoon of fixture recording buys a checkable equivalence claim vs trusting that a 12-file reorganization of the auth path changed nothing.",
              "header": "Regression",
              "multiSelect": false,
              "options": [
                {
                  "label": "Full characterization matrix recorded before the rewrite, plus 3 HTTP-level E2E flows (recommended)",
                  "description": "✅ Every error class the D8 pipeline maps has a pinned expected outcome before it is mapped; the rewrite cannot silently change a deny into an allow. ✅ Fixtures double as the spec for the new code and as the regression suite for the deferred Promise.all PR. ❌ Requires recording fixtures against the current code first, which sequences this work before any rewrite lands."
                },
                {
                  "label": "Integration tests for the happy path and one policy-deny path",
                  "description": "✅ Cheap and quick; catches gross breakage of the main flow. ✅ No fixture-recording step. ❌ Leaves revocation, suspension, expiry and every IDP failure path unpinned, which is exactly where auth regressions hide."
                },
                {
                  "label": "Unit tests on the new components only (the plan as written)",
                  "description": "✅ Already planned; zero additional work. ✅ Good coverage of the new code's own branches. ❌ Proves the new code does what the new code does; proves nothing about equivalence with legacyAuthFlow(), so the plan's goal stays unverified."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D9 — How do we prove the rewritten auth flow behaves exactly like legacyAuthFlow() does today?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, Section 3 Test review, regression rule (structure D6, wiring D7, error pipeline D8 approved).\nELI10: The whole point of this plan is \"same behavior, better organized\". Right now it plans tests for the new pieces but nothing that compares the new path to the old one, so the only proof of \"same behavior\" would be users not complaining. A characterization test records what the old code does for every kind of input (good token, expired, revoked, suspended tenant, identity provider down on call 3, and so on) before anything is touched, then runs the same inputs through the new code and demands identical answers. This question settles what must stay identical, what is allowed to differ, and what the acceptance assertions are. Skipping is not an option under the regression rule; the choice is how deep.\nStakes if we pick wrong: Too shallow and a tenant-suspension or revocation path silently changes and someone stays logged in after being revoked; the full matrix costs an afternoon of fixture recording.\nRecommendation: A because the input classes are enumerable from the plan's own contracts (PLAN.md:15-17 lists them), recording fixtures against the old code is mechanical, and this is the only test that makes the plan's central claim checkable (human: ~2 days / CC: ~30 min).\nCompleteness: A=10/10, B=5/10, C=2/10\nNet: an afternoon of fixture recording buys a checkable equivalence claim vs trusting that a 12-file reorganization of the auth path changed nothing.": "Full characterization matrix recorded before the rewrite, plus 3 HTTP-level E2E flows (recommended)"
          },
          "unansweredQuestionIndices": [],
          "answeredAt": "2026-09-16T06:00:44.286Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "toolUseId": "toolu_01M49b7g9F8XkefzPKkjqfSg",
          "questions": [
            {
              "question": "D10 — Capture the deferred IDP-call parallelization as a TODO?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, TODO 1 of 2 (deferred in D4).\nELI10: In D4 you pushed the \"run the 5 identity-provider calls at once\" speedup out of this PR so the refactor stays a pure move. Deferred work that is not written down with its reasoning tends to evaporate. This TODO records what it is, why it waited, and what must ship with it.\nWhat: Parallelize the 5 independent IDP validation calls (Promise.all or allSettled per required-ness) in AuthBroker.fetchClaims after the refactor lands.\nWhy: Cuts token-validation latency by up to ~5x on cache miss; every authenticated request on a cold cache pays this today.\nPros: Small, one-file change once the pipeline is linear (D8); the R6 fixtures already pin today's outcomes so the only new tests are error-ordering and burst behavior.\nCons: Changes which error surfaces first and sends a 5x burst to the IDP per validation; needs rate-limit headroom confirmed and p50/p95 before/after numbers.\nContext: Deferred by D4 in this review so a regression in the refactor is attributable. Start in AuthBroker.fetchClaims; reuse auth/__fixtures__/legacy-auth-flow.json as the regression suite; add a fail-fast ordering test.\nDepends on / blocked by: This refactor merged with R6 fixtures green.\nStakes if we pick wrong: Skip and the speedup is forgotten until someone profiles cold-cache auth latency; build now and you undo D4.\nRecommendation: A because the work is real, small, and has a clear trigger; it just belongs in its own PR.\nNote: options differ in kind, not coverage — no completeness score.\nNet: written-down follow-up with its acceptance criteria vs relying on memory.",
              "header": "TODO",
              "multiSelect": false,
              "options": [
                {
                  "label": "Add to TODOS.md (recommended)",
                  "description": "✅ The deferred speedup keeps its reasoning, acceptance criteria and starting file. ✅ Someone picking it up in 3 months knows it needs latency numbers and an error-ordering test. ❌ TODOS.md must be created after plan mode exits; until then the entry is presented as not persisted."
                },
                {
                  "label": "Skip — not valuable enough",
                  "description": "✅ No extra file to maintain. ✅ Keeps the backlog to items someone has committed to. ❌ A ~5x cold-cache latency win with a known plan disappears from the record."
                },
                {
                  "label": "Build it now in this PR instead of deferring",
                  "description": "✅ Speedup ships with the refactor. ✅ One review cycle. ❌ Reverses D4: a latency or error-ordering regression becomes unattributable across the refactor, and the R6 fixtures would have to encode new error semantics."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D10 — Capture the deferred IDP-call parallelization as a TODO?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, TODO 1 of 2 (deferred in D4).\nELI10: In D4 you pushed the \"run the 5 identity-provider calls at once\" speedup out of this PR so the refactor stays a pure move. Deferred work that is not written down with its reasoning tends to evaporate. This TODO records what it is, why it waited, and what must ship with it.\nWhat: Parallelize the 5 independent IDP validation calls (Promise.all or allSettled per required-ness) in AuthBroker.fetchClaims after the refactor lands.\nWhy: Cuts token-validation latency by up to ~5x on cache miss; every authenticated request on a cold cache pays this today.\nPros: Small, one-file change once the pipeline is linear (D8); the R6 fixtures already pin today's outcomes so the only new tests are error-ordering and burst behavior.\nCons: Changes which error surfaces first and sends a 5x burst to the IDP per validation; needs rate-limit headroom confirmed and p50/p95 before/after numbers.\nContext: Deferred by D4 in this review so a regression in the refactor is attributable. Start in AuthBroker.fetchClaims; reuse auth/__fixtures__/legacy-auth-flow.json as the regression suite; add a fail-fast ordering test.\nDepends on / blocked by: This refactor merged with R6 fixtures green.\nStakes if we pick wrong: Skip and the speedup is forgotten until someone profiles cold-cache auth latency; build now and you undo D4.\nRecommendation: A because the work is real, small, and has a clear trigger; it just belongs in its own PR.\nNote: options differ in kind, not coverage — no completeness score.\nNet: written-down follow-up with its acceptance criteria vs relying on memory.": "Add to TODOS.md (recommended)"
          },
          "unansweredQuestionIndices": [],
          "answeredAt": "2026-09-16T06:02:00.151Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "toolUseId": "toolu_01WtcNW2QWQjwxQs3aF4y8Jk",
          "questions": [
            {
              "question": "D11 — Capture \"verify cache-hit short-circuits IDP calls\" as a TODO?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, TODO 2 of 2 (from Performance finding P2, medium confidence).\nELI10: The plan says token validation makes 5 calls to the identity provider, and separately says there is a cache. It never says whether a cache hit skips those 5 calls. If it does not, every request is paying the full identity-provider cost and the cache is only saving the decision, not the network. The R6 fixture recording will reveal the answer for free (it records the call sequence per input). This TODO makes sure someone acts on that answer instead of just noticing it.\nWhat: Confirm from the R6 fixtures whether a cache hit avoids the 5 IDP calls; if not, add short-circuit-on-hit as its own follow-up PR with latency numbers.\nWhy: If the cache does not short-circuit, this is a bigger latency win than parallelization and a straightforward one.\nPros: Zero investigation cost, the fixtures answer it; clear go/no-go.\nCons: Might turn out to be a non-issue (medium confidence 5/10); short-circuiting changes revocation-freshness semantics and needs its own test.\nContext: Raised as P2 in this review. Look at the recorded IDP call sequence for the \"valid token, cache hit\" fixture; if it shows 5 calls, open the follow-up.\nDepends on / blocked by: R6 fixtures recorded.\nStakes if we pick wrong: Skip and a possibly large latency win stays invisible; add and it may close as no-op after a two-minute check.\nRecommendation: A because the check is nearly free and the payoff if positive is large; a TODO that closes quickly costs nothing.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a cheap tracked check vs one less backlog item.",
              "header": "TODO",
              "multiSelect": false,
              "options": [
                {
                  "label": "Add to TODOS.md (recommended)",
                  "description": "✅ Ensures the fixture recording's answer about cache-hit behavior turns into action or an explicit close. ✅ Two-minute check with a potentially large latency payoff. ❌ May close as a no-op if the cache already short-circuits; TODOS.md creation waits for plan-mode exit."
                },
                {
                  "label": "Skip — not valuable enough",
                  "description": "✅ Keeps the backlog lean; whoever records fixtures will probably notice anyway. ✅ Avoids a TODO with a 50% chance of being moot. ❌ Relies on someone noticing and acting without a written prompt."
                },
                {
                  "label": "Build it now in this PR instead of deferring",
                  "description": "✅ If the cache does not short-circuit, users get the win immediately. ✅ Fixtures are being recorded anyway. ❌ Short-circuit-on-hit is a behavior change (revocation freshness); bundling it violates the D4 principle of keeping this PR a pure move."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D11 — Capture \"verify cache-hit short-circuits IDP calls\" as a TODO?\nProject/branch/task: main, PLAN.md Multi-tenant Auth Refactor, TODO 2 of 2 (from Performance finding P2, medium confidence).\nELI10: The plan says token validation makes 5 calls to the identity provider, and separately says there is a cache. It never says whether a cache hit skips those 5 calls. If it does not, every request is paying the full identity-provider cost and the cache is only saving the decision, not the network. The R6 fixture recording will reveal the answer for free (it records the call sequence per input). This TODO makes sure someone acts on that answer instead of just noticing it.\nWhat: Confirm from the R6 fixtures whether a cache hit avoids the 5 IDP calls; if not, add short-circuit-on-hit as its own follow-up PR with latency numbers.\nWhy: If the cache does not short-circuit, this is a bigger latency win than parallelization and a straightforward one.\nPros: Zero investigation cost, the fixtures answer it; clear go/no-go.\nCons: Might turn out to be a non-issue (medium confidence 5/10); short-circuiting changes revocation-freshness semantics and needs its own test.\nContext: Raised as P2 in this review. Look at the recorded IDP call sequence for the \"valid token, cache hit\" fixture; if it shows 5 calls, open the follow-up.\nDepends on / blocked by: R6 fixtures recorded.\nStakes if we pick wrong: Skip and a possibly large latency win stays invisible; add and it may close as no-op after a two-minute check.\nRecommendation: A because the check is nearly free and the payoff if positive is large; a TODO that closes quickly costs nothing.\nNote: options differ in kind, not coverage — no completeness score.\nNet: a cheap tracked check vs one less backlog item.": "Add to TODOS.md (recommended)"
          },
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          "answeredAt": "2026-09-16T06:02:20.745Z"
        },
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          "questions": [
            {
              "question": "D12 — Where next after the eng review?\nProject/branch/task: gstack-plan-count-G18mVB @ main — Multi-tenant Auth Refactor, eng review CLEAR with scope reduced.\nELI10: The engineering review is done and every finding has an approved fix, so the plan is buildable as written. The remaining choice is whether to spend one more pass questioning *whether* to build this shape at all (a CEO-style scope review) or to go straight to implementation. There is no UI in this plan, so a design review has nothing to look at.\nStakes if we pick wrong: Skipping a CEO pass risks building a well-engineered refactor nobody asked for in this form; running it costs ~10 minutes and may re-open decisions already settled here.\nRecommendation: B because the plan author already framed this as a behavior-preserving refactor and the review cut scope hard; a strategy pass has little left to cut.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Run /plan-ceo-review (soft: optional)\n  ✅ Independent check on whether the refactor is worth doing now versus shipping only the fixtures and logging.\n  ✅ Would confirm the SCOPE_REDUCED cut from a product/strategy angle rather than an engineering one.\n  ❌ Likely re-litigates D4–D6, which were already decided with full briefs; adds a pass with low expected new information.\nB) Ready to implement (recommended)\n  ✅ Tasks T1–T9 are ordered, verified and lane-assigned; the first commit (fixtures) is unambiguous and low-risk.\n  ✅ Exits plan mode now so the deferred CLAUDE.md routing rules (D1) and TODOS.md (D10/D11) can be written and committed.\n  ❌ No strategy-level second opinion on this plan; the outside codex voice was also disabled, so engineering is the only review lens applied.\nNet: One more review pass with little left to cut, versus starting on a plan that is already fully decided.",
              "header": "Next step",
              "multiSelect": false,
              "options": [
                {
                  "label": "Ready to implement (recommended)",
                  "description": "Exit plan mode; start with T1 fixtures, then write CLAUDE.md routing rules (D1) and TODOS.md (D10/D11)."
                },
                {
                  "label": "Run /plan-ceo-review (soft)",
                  "description": "Optional strategy/scope pass on the reduced plan before implementation."
                }
              ]
            }
          ],
          "answered": true,
          "failed": false,
          "answers": {
            "D12 — Where next after the eng review?\nProject/branch/task: gstack-plan-count-G18mVB @ main — Multi-tenant Auth Refactor, eng review CLEAR with scope reduced.\nELI10: The engineering review is done and every finding has an approved fix, so the plan is buildable as written. The remaining choice is whether to spend one more pass questioning *whether* to build this shape at all (a CEO-style scope review) or to go straight to implementation. There is no UI in this plan, so a design review has nothing to look at.\nStakes if we pick wrong: Skipping a CEO pass risks building a well-engineered refactor nobody asked for in this form; running it costs ~10 minutes and may re-open decisions already settled here.\nRecommendation: B because the plan author already framed this as a behavior-preserving refactor and the review cut scope hard; a strategy pass has little left to cut.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Run /plan-ceo-review (soft: optional)\n  ✅ Independent check on whether the refactor is worth doing now versus shipping only the fixtures and logging.\n  ✅ Would confirm the SCOPE_REDUCED cut from a product/strategy angle rather than an engineering one.\n  ❌ Likely re-litigates D4–D6, which were already decided with full briefs; adds a pass with low expected new information.\nB) Ready to implement (recommended)\n  ✅ Tasks T1–T9 are ordered, verified and lane-assigned; the first commit (fixtures) is unambiguous and low-risk.\n  ✅ Exits plan mode now so the deferred CLAUDE.md routing rules (D1) and TODOS.md (D10/D11) can be written and committed.\n  ❌ No strategy-level second opinion on this plan; the outside codex voice was also disabled, so engineering is the only review lens applied.\nNet: One more review pass with little left to cut, versus starting on a plan that is already fully decided.": "Ready to implement (recommended)"
          },
          "unansweredQuestionIndices": [],
          "answeredAt": "2026-09-16T06:08:19.108Z"
        }
      ],
      "assistantMessages": [
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "text": "Scope gate: plan mode — auto-selected B (reviewing `PLAN.md`: \"Plan: Multi-tenant Auth Refactor\").",
          "timestamp": "2026-09-16T05:51:58.246Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "text": "Noted: routing rules will be appended to CLAUDE.md and committed after this review exits plan mode (edits outside the plan file are blocked right now).",
          "timestamp": "2026-09-16T05:52:23.462Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "text": "No worries — standard review. If you ever want sharper input, try /office-hours first next time.",
          "timestamp": "2026-09-16T05:54:02.165Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "text": "## Step 0: Scope Challenge\n\nEvidence base: `PLAN.md` only. The repo holds no source, so every finding quotes plan lines and is a proposal-level finding, not an observed runtime bug. Web research ran via WebSearch (Aside not installed).\n\n**1. What already exists (per the plan's own text)**\n- Cache adapter keyed by tenant/issuer/audience/policy-version, with eviction and invalidation hooks and existing tests (`PLAN.md:15-21`). Plan reuses it. Good.\n- Per-request allow/deny decision logic (`PLAN.md:8-10`). Plan regroups it as `RequestPolicy`.\n- `legacyAuthFlow()` (`PLAN.md:35`). Plan rewrites it. This is the behavior being reorganized, so it is also the oracle for \"no product behavior change\".\n\n**2. Minimum change for the stated goal (\"reorganize without changing product behavior\")**\nTwo things in the plan are not reorganization: the `Promise.all` parallelization (`PLAN.md:39-40`) changes error semantics and IDP call volume, and `TokenStore` (`PLAN.md:43`) is named once and never described. Both are candidates to cut or defer.\n\n**3. Complexity check: 12 files, 5 new classes.** Over both thresholds (8+ files, 2+ classes). Gate fires below.\n\n**4. Search check** [Layer 1, tried and true]: module-level mutable singletons hide dependencies and break test isolation (Jest re-instantiates module graphs per worker); constructor injection is the boring fix. `Promise.all` is fail-fast and still fires all calls; if any of the 5 IDP calls is required, fail-fast is correct, but it changes which error surfaces first. Sources: [OpenReplay on singletons](https://blog.openreplay.com/singletons-javascript-tool-trap/), [DI in Node/TS](https://thetshaped.dev/p/dependency-injection-in-nodejs-and-typescript-dependency-inversion-part-no-body-teaches-you), [MDN Promise.all](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all), [allSettled vs all](https://jsmanifest.com/promise-allsettled-vs-promise-all).\n\n**5. TODOS.md:** absent. **6. Completeness:** the plan takes a shortcut on the one test that proves its own goal (regression on `legacyAuthFlow()`). **7. Distribution:** no new artifact, N/A.\n\n**Scope Challenge findings**\n\n| # | Sev | Conf | Source | Finding | Disposition |\n|---|---|---|---|---|---|\n| S1 | P1 | 9/10 | `PLAN.md:27-28` \"share a global mutable `AuthCache` instance via module-level export. Both services mutate it.\" | Hidden shared dependency; untestable in isolation; two writers, no ownership | pending (Section 1) |\n| S2 | P1 | 9/10 | `PLAN.md:35-36` \"no regression test for the prior behavior is planned\" + `:22-24` | Plan's goal is behavior preservation and it plans no proof of it | pending (Section 3, regression rule) |\n| S3 | P2 | 8/10 | `PLAN.md:39-40` \"parallelized via Promise.all trivially\" | Not a refactor: changes fail-fast ordering, fires 5 calls even when the first would have rejected, 5x burst on the IDP | pending (gate D4) |\n| S4 | P2 | 8/10 | `PLAN.md:43` \"TokenStore\" | Named in the class list, described nowhere in the plan | pending (gate D5) |\n| S5 | P2 | 7/10 | `PLAN.md:19-20` \"service-facing facade over that same existing adapter, with one backing cache\" | A class layer that adds no stated behavior over the adapter | pending (gate D6) |\n| S6 | P2 | 7/10 | `PLAN.md:8-12` \"adds no policy, network call, cache mutation or state\" | Stateless allow/deny is a pure function, not a class | pending (gate D6) |\n| S7 | P2 | 8/10 | `PLAN.md:31-32` \"three nested try/catch blocks; each catch swallows a different error class\" | Described but no remedy proposed; swallowing in auth means silent allow/deny errors | pending (Section 2) |\n| S8 | P2 | 9/10 | `PLAN.md:43-44` \"12 files ... 5 new classes\" | Complexity gate | asking now |\n\nComplexity gate: three questions, one at a time. Feature deferrals first (D4, D5), then structure (D6).",
          "timestamp": "2026-09-16T05:55:27.839Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "text": "Section 2 dispositions: C1 approved (D8, linear pipeline), C2 carried as required proof, C3 folded into C1.\n\n## Section 3: Test review\n\nFramework: unknown (no `package.json`, no test files in this fixture repo; `Promise.all` implies a JS/TS runtime, so examples below assume `*.test.ts`, confirm at implementation). Nothing installed, nothing built.\n\nCoverage diagram (all paths are planned code; nothing exists yet to be TESTED, so every branch is a GAP until the tests below land):\n\n```\nCODE PATHS                                                   USER FLOWS\n[+] auth/AuthBroker.ts                                       [+] Authenticated request\n  ├── validateAndDispatch()                                    ├── [GAP] [→E2E] valid token → handler runs\n  │   ├── [GAP] fetchClaims: 5 IDP calls ok                    ├── [GAP] [→E2E] revoked token → 401 (same as today)\n  │   ├── [GAP] fetchClaims: IDP timeout at call k (k=1..5)    └── [GAP] [→E2E] suspended tenant → same status as today\n  │   ├── [GAP] fetchClaims: IDP 5xx at call k               [+] Error states\n  │   ├── [GAP] lookupCache: hit / miss / expired-evicted       ├── [GAP] IDP down → user sees today's error, log line emitted\n  │   ├── [GAP] decideAccess → allow → dispatch                 ├── [GAP] malformed / missing token → today's 4xx\n  │   ├── [GAP] decideAccess → deny → today's reject            └── [GAP] suspension hook fires mid-request (A3)\n  │   ├── [GAP] known error class → mapped outcome + log      [+] Concurrency\n  │   └── [GAP] unknown error → rethrows                        ├── [GAP] two requests, same tenant, cache miss (dedupe? as today)\n[+] auth/decideAccess.ts (pure)                                └── [GAP] logout during in-flight mint\n  ├── [GAP] table: each claims × ctx case → allow/deny\n  └── [GAP] purity: module imports no adapter/IDP/clock\n[+] auth/SessionMint.ts\n  ├── [GAP] mint writes one entry via injected adapter\n  ├── [GAP] mint with revoked/suspended claims → no write\n  └── [GAP] adapter write failure → today's outcome\n[+] bootstrap/composition root\n  └── [GAP] both services receive the same adapter instance\n[+] legacyAuthFlow() equivalence (R6)\n  └── [GAP] [→E2E] characterization fixtures old == new     (pending D9)\n\nLLM integration: none\n\nCOVERAGE: 0/22 paths tested (0%)  |  Code paths: 0/14 (0%)  |  User flows: 0/8 (0%)\nQUALITY: n/a (no existing tests for these paths)  |  GAPS: 22 (4 E2E, 0 eval)\n```\n\nLegend: ★★★ behavior + edge + error | ★★ happy path | ★ smoke | [→E2E] integration test needed.\n\nFindings:\n- **T1** [P1 CRITICAL] (9/10) `PLAN.md:35-36` rewrite of `legacyAuthFlow()` with no regression coverage → REGRESSION RULE → D9.\n- **T2** [P2] (9/10) Required proof of approved contracts, no new question: D7 fake-adapter + same-instance tests; D8 per-error-class outcome + log tests; D6 `decideAccess` table + purity test.\n- **T3** [P2] (7/10) A3 mid-flight suspension flow has no named expected behavior; folded into D9's input matrix.\n\nOne pending choice (R6 → D9). Record saved and read back.",
          "timestamp": "2026-09-16T06:00:33.142Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "text": "Approval readiness check: R1→D4, R2→D5, R3→D6, R4→D7, R5→D8, R6→D9 all carry actual answers with accepted scope. PASS. Assembling the full reviewed plan and report.",
          "timestamp": "2026-09-16T06:02:46.348Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "text": "Read-back gate on the report file, then the JSONL tasks artifact and review log.",
          "timestamp": "2026-09-16T06:07:14.318Z"
        },
        {
          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
          "text": "Tasks artifact, review log and decision log (id `5c7b890e`) are written. Now the Review Readiness Dashboard.",
          "timestamp": "2026-09-16T06:07:51.888Z"
        }
      ],
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          "sessionId": "e1a14f84-7415-4840-907f-58aac32edd06",
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          "timestamp": "2026-09-16T06:09:08.346Z",
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      "options": [
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          "label": "Ready to implement (recommended)"
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          "index": 2,
          "label": "Run /plan-ceo-review (soft)"
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          {
            "question": "D12 — Where next after the eng review?\nProject/branch/task: gstack-plan-count-G18mVB @ main — Multi-tenant Auth Refactor, eng review CLEAR with scope reduced.\nELI10: The engineering review is done and every finding has an approved fix, so the plan is buildable as written. The remaining choice is whether to spend one more pass questioning *whether* to build this shape at all (a CEO-style scope review) or to go straight to implementation. There is no UI in this plan, so a design review has nothing to look at.\nStakes if we pick wrong: Skipping a CEO pass risks building a well-engineered refactor nobody asked for in this form; running it costs ~10 minutes and may re-open decisions already settled here.\nRecommendation: B because the plan author already framed this as a behavior-preserving refactor and the review cut scope hard; a strategy pass has little left to cut.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Run /plan-ceo-review (soft: optional)\n  ✅ Independent check on whether the refactor is worth doing now versus shipping only the fixtures and logging.\n  ✅ Would confirm the SCOPE_REDUCED cut from a product/strategy angle rather than an engineering one.\n  ❌ Likely re-litigates D4–D6, which were already decided with full briefs; adds a pass with low expected new information.\nB) Ready to implement (recommended)\n  ✅ Tasks T1–T9 are ordered, verified and lane-assigned; the first commit (fixtures) is unambiguous and low-risk.\n  ✅ Exits plan mode now so the deferred CLAUDE.md routing rules (D1) and TODOS.md (D10/D11) can be written and committed.\n  ❌ No strategy-level second opinion on this plan; the outside codex voice was also disabled, so engineering is the only review lens applied.\nNet: One more review pass with little left to cut, versus starting on a plan that is already fully decided.",
            "header": "Next step",
            "multiSelect": false,
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              {
                "label": "Ready to implement (recommended)",
                "description": "Exit plan mode; start with T1 fixtures, then write CLAUDE.md routing rules (D1) and TODOS.md (D10/D11)."
              },
              {
                "label": "Run /plan-ceo-review (soft)",
                "description": "Optional strategy/scope pass on the reduced plan before implementation."
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          "D12 — Where next after the eng review?\nProject/branch/task: gstack-plan-count-G18mVB @ main — Multi-tenant Auth Refactor, eng review CLEAR with scope reduced.\nELI10: The engineering review is done and every finding has an approved fix, so the plan is buildable as written. The remaining choice is whether to spend one more pass questioning *whether* to build this shape at all (a CEO-style scope review) or to go straight to implementation. There is no UI in this plan, so a design review has nothing to look at.\nStakes if we pick wrong: Skipping a CEO pass risks building a well-engineered refactor nobody asked for in this form; running it costs ~10 minutes and may re-open decisions already settled here.\nRecommendation: B because the plan author already framed this as a behavior-preserving refactor and the review cut scope hard; a strategy pass has little left to cut.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Run /plan-ceo-review (soft: optional)\n  ✅ Independent check on whether the refactor is worth doing now versus shipping only the fixtures and logging.\n  ✅ Would confirm the SCOPE_REDUCED cut from a product/strategy angle rather than an engineering one.\n  ❌ Likely re-litigates D4–D6, which were already decided with full briefs; adds a pass with low expected new information.\nB) Ready to implement (recommended)\n  ✅ Tasks T1–T9 are ordered, verified and lane-assigned; the first commit (fixtures) is unambiguous and low-risk.\n  ✅ Exits plan mode now so the deferred CLAUDE.md routing rules (D1) and TODOS.md (D10/D11) can be written and committed.\n  ❌ No strategy-level second opinion on this plan; the outside codex voice was also disabled, so engineering is the only review lens applied.\nNet: One more review pass with little left to cut, versus starting on a plan that is already fully decided.": "Ready to implement (recommended)"
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        "answeredAt": "2026-09-16T06:08:19.108Z"
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              "question": "D12 — Where next after the eng review?\nProject/branch/task: gstack-plan-count-G18mVB @ main — Multi-tenant Auth Refactor, eng review CLEAR with scope reduced.\nELI10: The engineering review is done and every finding has an approved fix, so the plan is buildable as written. The remaining choice is whether to spend one more pass questioning *whether* to build this shape at all (a CEO-style scope review) or to go straight to implementation. There is no UI in this plan, so a design review has nothing to look at.\nStakes if we pick wrong: Skipping a CEO pass risks building a well-engineered refactor nobody asked for in this form; running it costs ~10 minutes and may re-open decisions already settled here.\nRecommendation: B because the plan author already framed this as a behavior-preserving refactor and the review cut scope hard; a strategy pass has little left to cut.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Run /plan-ceo-review (soft: optional)\n  ✅ Independent check on whether the refactor is worth doing now versus shipping only the fixtures and logging.\n  ✅ Would confirm the SCOPE_REDUCED cut from a product/strategy angle rather than an engineering one.\n  ❌ Likely re-litigates D4–D6, which were already decided with full briefs; adds a pass with low expected new information.\nB) Ready to implement (recommended)\n  ✅ Tasks T1–T9 are ordered, verified and lane-assigned; the first commit (fixtures) is unambiguous and low-risk.\n  ✅ Exits plan mode now so the deferred CLAUDE.md routing rules (D1) and TODOS.md (D10/D11) can be written and committed.\n  ❌ No strategy-level second opinion on this plan; the outside codex voice was also disabled, so engineering is the only review lens applied.\nNet: One more review pass with little left to cut, versus starting on a plan that is already fully decided.",
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        "content": "Your questions have been answered: \"D12 — Where next after the eng review?\nProject/branch/task: gstack-plan-count-G18mVB @ main — Multi-tenant Auth Refactor, eng review CLEAR with scope reduced.\nELI10: The engineering review is done and every finding has an approved fix, so the plan is buildable as written. The remaining choice is whether to spend one more pass questioning *whether* to build this shape at all (a CEO-style scope review) or to go straight to implementation. There is no UI in this plan, so a design review has nothing to look at.\nStakes if we pick wrong: Skipping a CEO pass risks building a well-engineered refactor nobody asked for in this form; running it costs ~10 minutes and may re-open decisions already settled here.\nRecommendation: B because the plan author already framed this as a behavior-preserving refactor and the review cut scope hard; a strategy pass has little left to cut.\nNote: options differ in kind, not coverage — no completeness score.\nPros / cons:\nA) Run /plan-ceo-review (soft: optional)\n  ✅ Independent check on whether the refactor is worth doing now versus shipping only the fixtures and logging.\n  ✅ Would confirm the SCOPE_REDUCED cut from a product/strategy angle rather than an engineering one.\n  ❌ Likely re-litigates D4–D6, which were already decided with full briefs; adds a pass with low expected new information.\nB) Ready to implement (recommended)\n  ✅ Tasks T1–T9 are ordered, verified and lane-assigned; the first commit (fixtures) is unambiguous and low-risk.\n  ✅ Exits plan mode now so the deferred CLAUDE.md routing rules (D1) and TODOS.md (D10/D11) can be written and committed.\n  ❌ No strategy-level second opinion on this plan; the outside codex voice was also disabled, so engineering is the only review lens applied.\nNet: One more review pass with little left to cut, versus starting on a plan that is already fully decided.\"=\"Ready to implement (recommended)\". You can now continue with these answers in mind.",
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    ],
    "screen": " - AuthBroker + SessionMint classes with constructor-injected { cache, idp, clock, logger }; one adapter instance\n   created at the composition root; no module-level cache export.\n - decideAccess(claims, ctx): AccessDecision pure function replaces the RequestPolicy class.\n - AuthCache facade dropped; TokenStore cut; Promise.all IDP parallelization deferred to a follow-up PR.\n - validateAndDispatch() → linear fetchClaims → lookupCache → decideAccess → dispatch with one error-to-outcome map,\n   one log per formerly silent path, unknown errors rethrow.\n - legacyAuthFlow() characterization fixtures (auth/__fixtures__/legacy-auth-flow.json) recorded BEFORE any rewrite;\n   replayed in auth/AuthBroker.regression.test.ts; plus 3 HTTP E2E flows.\n\n Implementation order (tasks T1–T9 in the deliverable)\n\n 1. T1 fixtures (first commit) ‖ T2 decideAccess — parallel lanes\n 2. T3 AuthBroker → T4 SessionMint → T5 composition root\n 3. T6 regression replay + E2E, retire legacyAuthFlow()\n 4. T7 hygiene, T8 diagrams\n\n Deferred until plan mode exits (not yet persisted)\n\n - D1: append gstack skill routing rules to CLAUDE.md; commit chore: add gstack skill routing rules to CLAUDE.md.\n - D10/D11: create TODOS.md with the two accepted TODOs (text in the deliverable under \"Accepted TODOs\").\n\n Verification\n\n - Fixture suite green against current code before any rewrite; byte-identical replay against AuthBroker.\n - One unit test per known error class (outcome + log); unknown-error-propagates test.\n - Fake-adapter test per service; composition-root same-instance test.\n - 3 E2E flows: valid → handler runs; revoked → today's status; suspended tenant → today's status.\n\n Artifacts: tasks JSONL ~/.gstack/projects/gstack-plan-count-G18mVB/tasks-eng-review-20260916-060748.jsonl; QA test\n plan ~/.gstack/projects/gstack-plan-count-G18mVB/vercel-sandbox-main-eng-review-test-plan-20260916-060124.md.\n╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌\n\n────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────\n Claude has written up a plan and is ready to execute. Would you like to proceed?\n\n ❯ 1. Yes, and use auto mode\n   2. Yes, manually approve edits\n   3. Tell Claude what to change\n      shift+tab to approve with this feedback\n",
    "selection": "Exact retained native calls, answers, current report and pending ExitPlanMode at the cancelled gate. No approval was sent. Private free replay changes only the owned report file location and preserves its original mtime; cancellation remains separate from a test verdict.",
    "startedAtSource": "Retained observation.capture.at 2026-09-16T06:11:00.002Z minus elapsedMs 1157052; same derivation used by inventory. No separate start receipt was retained."
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}