docs: add test coverage catalog to CHANGELOG + update project structure

- CHANGELOG: add 6 entries for coverage audit, review Step 4.75, E2E
  recommendations, regression iron rule, failure triage, repo-mode fix
- CLAUDE.md: add missing skill directories (autoplan, benchmark, canary,
  codex, land-and-deploy, setup-deploy) to project structure

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -58,11 +58,20 @@
 - **Every workflow skill now searches before recommending.** Before suggesting infrastructure patterns, concurrency approaches, or framework-specific solutions, gstack checks if the runtime has a built-in and whether the pattern is current best practice. Three layers of knowledge — tried-and-true (Layer 1), new-and-popular (Layer 2), and first-principles (Layer 3) — with the most valuable insights prized above all.
 - **Eureka moments.** When first-principles reasoning reveals that conventional wisdom is wrong, gstack names it, celebrates it, and logs it. Your weekly `/retro` now surfaces these insights so you can see where your projects zigged while others zagged.
 - **`/office-hours` adds Landscape Awareness phase.** After understanding your problem through questioning but before challenging premises, gstack searches for what the world thinks — then runs a three-layer synthesis to find where conventional wisdom might be wrong for your specific case.
+- **Test coverage audit now works everywhere — plan, ship, and review.** The codepath tracing methodology (ASCII diagrams, quality scoring, gap detection) is now shared across `/plan-eng-review`, `/ship`, and `/review` via a single resolver. Plan mode adds missing tests to your plan. Ship mode auto-generates tests for gaps. Review mode finds untested paths during pre-landing review.
+- **`/review` Step 4.75 — test coverage diagram.** Before landing code, `/review` now traces every changed codepath and produces an ASCII coverage map showing what's tested (★★★/★★/★) and what's not (GAP). Gaps become INFORMATIONAL findings that follow the Fix-First flow.
+- **E2E test recommendations built in.** The coverage audit knows when to recommend E2E tests (common user flows, tricky integrations where unit tests can't cover it) vs unit tests, and flags LLM prompt changes that need eval coverage.
+- **Regression detection iron rule.** When a code change modifies existing behavior, gstack always writes a regression test — no asking, no skipping.
+- **`/ship` failure triage.** When tests fail during ship, the coverage audit now classifies each failure and recommends next steps instead of just dumping the error.
 - **`/plan-eng-review` adds search check.** Step 0 now verifies architectural patterns against current best practices and flags custom solutions where built-ins exist.
 - **`/investigate` searches on hypothesis failure.** When your first debugging hypothesis is wrong, gstack searches for the exact error message and known framework issues before guessing again.
 - **`/design-consultation` three-layer synthesis.** Competitive research now uses the structured Layer 1/2/3 framework to find where your product should deliberately break from category norms.
 - **CEO review saves context when handing off to `/office-hours`.** When `/plan-ceo-review` suggests running `/office-hours` first, it now saves a handoff note with your system audit findings and any discussion so far. When you come back and re-invoke `/plan-ceo-review`, it picks up that context automatically — no more starting from scratch.
 
+### Fixed
+
+- **gstack no longer crashes in repos without an `origin` remote.** The `gstack-repo-mode` helper now gracefully handles missing remotes, bare repos, and empty git output — defaulting to `unknown` mode instead of crashing the preamble.
+
 ## [0.9.4.1] - 2026-03-20
 
 ### Changed

CLAUDE.md

@@ -71,10 +71,16 @@ gstack/
 ├── review/          # PR review skill
 ├── plan-ceo-review/ # /plan-ceo-review skill
 ├── plan-eng-review/ # /plan-eng-review skill
+├── autoplan/        # /autoplan skill (auto-review pipeline: CEO → design → eng)
+├── benchmark/       # /benchmark skill (performance regression detection)
+├── canary/          # /canary skill (post-deploy monitoring loop)
+├── codex/           # /codex skill (multi-AI second opinion via OpenAI Codex CLI)
+├── land-and-deploy/ # /land-and-deploy skill (merge → deploy → canary verify)
 ├── office-hours/    # /office-hours skill (YC Office Hours — startup diagnostic + builder brainstorm)
 ├── investigate/     # /investigate skill (systematic root-cause debugging)
 ├── retro/           # Retrospective skill
 ├── document-release/ # /document-release skill (post-ship doc updates)
+├── setup-deploy/    # /setup-deploy skill (one-time deploy config)
 ├── bin/             # CLI utilities (gstack-repo-mode, gstack-slug, gstack-config, etc.)
 ├── setup            # One-time setup: build binary + symlink skills
 ├── SKILL.md         # Generated from SKILL.md.tmpl (don't edit directly)