docs: loadout render cost and the modules/ directory in PROJECT_STRUCTURE

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

CONTRIBUTING.md

@@ -205,7 +205,7 @@ the new defaults.
 | Validate periodic cases on a branch in CI | `gh workflow run evals-periodic.yml --ref <branch>` (periodic lane only) | CI runners + API spend | Pushed branch, `gh` with workflow rights |
 | Validate periodic cases plus the weekly gate census on a branch | `gh workflow run evals-periodic.yml --ref <branch> -f include_gate_census=true` | CI runners + API spend | Pushed branch, `gh` with workflow rights |
 | Run the opt-in ML, gitleaks and Swift checks | `gh workflow run platform-qualification.yml --ref <branch>` | Free CI runners | Pushed branch, `gh` with workflow rights |
-| Render one module loadout as an eval arm ([loadouts](docs/loadouts.md)) | `bin/gstack-modules render --host claude --modules full,-section:<skill>/<id> --out-dir <dir>` (`--loadout full` for the control) | Free, about 20 s per host | Bun 1.4.2 |
+| Render one module loadout as an eval arm ([loadouts](docs/loadouts.md)) | `bin/gstack-modules render --host claude --modules full,-section:<skill>/<id> --out-dir <dir>` (`--loadout full` for the control) | Free, about a second per host | Bun 1.4.2 |
 | Look at past local eval runs | `bun run eval:list` / `eval:compare` / `eval:summary` | Free | Local eval history |
 | See a case's pass rate across recent weekly runs | `bun run eval:pass-rates --case <case-id>` | Free | `gh` with repo read access |
 | Measure one red case alone against the ship bar (MEETS 9/10) | `bun run scripts/ship-measure.ts measure --case <case-id> --round baseline` ([bar](docs/TESTING_INTERNALS.md#ship-measure)) | API spend for 10 trials (12 for behavior); asks above $2/trial, stops at $25/case | Same as paid coverage |

docs/PROJECT_STRUCTURE.md

@@ -92,6 +92,7 @@ gstack/
 │   ├── test/        # Integration tests
 │   └── dist/        # Compiled binary
 ├── agents-digest/   # Committed 2KB instruction-tier rules digest (gstack-AGENTS.md) for rules-reading hosts
+├── modules/         # loadouts.json (+ loadouts.schema.json): model rungs, pinned modules and named loadouts; read by scripts/modules.ts, rendered by bin/gstack-modules (docs/loadouts.md)
 ├── extension/       # Chrome extension (side panel + activity feed + CSS inspector)
 ├── lib/             # Shared libraries (aside-render.ts = local-HTML rendering, Aside first, engine fallback; design-catalog.ts = the typed design anti-pattern catalog every design skill renders from; design-lint/ = the static and render tiers behind bin/gstack-design-lint, ported from hallmark's sloplint; design-detect-contract.ts = detector sentinel vocabulary; design-md.ts = open DESIGN.md reader/writer; dom-dump-script.ts + generated dom-dump.js = rendered-DOM dump for the detector; review-evidence.ts = review-start receipt binding, computed freshness and shared-code snapshot eligibility; frontend-scope.ts; claude-bin.ts, error-handling.ts, worktree.ts, egress-receipt.ts, context-bill.ts, redact-engine.ts, tracker-guard.ts, version-source.ts, code-intelligence/)
 │   └── diagram-render/  # Vendored mermaid + excalidraw runtimes, built into one offline bundle the renderer loads