docs: cut ledger in project structure, gstack-modules list and the loadout error codes (Step 14.5 audit)

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

docs/PROJECT_STRUCTURE.md

@@ -94,7 +94,7 @@ 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, the model map, pinned modules and named loadouts; read by scripts/modules.ts and lib/model-detect.ts, rendered by bin/gstack-modules (docs/loadouts.md)
+├── modules/         # loadouts.json (+ loadouts.schema.json): model rungs, the model map, pinned modules and named loadouts; read by scripts/modules.ts and lib/model-detect.ts, rendered by bin/gstack-modules (docs/loadouts.md); cuts.json = the R56 cut ledger (pieces cut from one skill in every loadout, read by scripts/cut-ledger.ts, ratchet test/cut-ledger.test.ts)
 ├── 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

docs/loadouts.md

@@ -18,7 +18,7 @@ One model has its own loadout: Claude Opus 5.5 gets `lite` ([below](#lite-on-cla
 ## Commands
 
 ```bash
-bin/gstack-modules list [--json] [--pinned]   # every module id, kind, source, pin, source bytes and sha256
+bin/gstack-modules list [--json] [--pinned]   # every module id, kind, source, pin or cut status, source bytes and sha256
 bin/gstack-modules validate                   # check modules/loadouts.json against the catalog
 bin/gstack-modules render --host claude --loadout full --out-dir ~/arms/control
 bin/gstack-modules render --host claude \

docs/troubleshooting.md

@@ -6483,7 +6483,7 @@ These codes come from `bin/gstack-modules` and `gen-skill-docs --loadout/--modul
 <a id="loadouts-invalid"></a>
 ### `LOADOUTS_INVALID: modules/loadouts.json …`
 
-**Meaning.** `modules/loadouts.json` is unreadable, or names a module, base loadout, rung or default that does not exist, excludes a pinned module, or maps one model id to two rungs. **Fix.** Correct the named entries, then run `bin/gstack-modules validate` until it prints `LOADOUTS: ok`; `git checkout -- modules/loadouts.json` restores the committed file.
+**Meaning.** `modules/loadouts.json` is unreadable, or names a module, base loadout, rung or default that does not exist, names a cut module (a `part:<skill>/<name>` id from `modules/cuts.json`), excludes a pinned module, or maps one model id to two rungs. **Fix.** Correct the named entries, then run `bin/gstack-modules validate` until it prints `LOADOUTS: ok`; `git checkout -- modules/loadouts.json` restores the committed file.
 
 <a id="loadout-unknown"></a>
 ### `LOADOUT_UNKNOWN: "<name>" is not a loadout (valid: …)`
@@ -6508,7 +6508,7 @@ These codes come from `bin/gstack-modules` and `gen-skill-docs --loadout/--modul
 <a id="module-spec-invalid"></a>
 ### `MODULE_SPEC_INVALID: …`
 
-**Meaning.** A `--modules` token is not `-<module id>` or `+<module id>`, both `--loadout` and `--modules` were given, `gen:skill-docs` got a selection with exclusions but no `--out-dir`, or a render flag is missing or malformed. **Fix.** Write the spec as `<loadout>,-<id>,+<id>` (for example `full,-section:office-hours/second-opinion`) and pass the flags `bin/gstack-modules --help` lists.
+**Meaning.** A `--modules` token is not `-<module id>` or `+<module id>`, a token names a cut (a `part:<skill>/<name>` id, removed in every loadout by `modules/cuts.json`; drop it from the spec), both `--loadout` and `--modules` were given, `gen:skill-docs` got a selection with exclusions but no `--out-dir`, or a render flag is missing or malformed. **Fix.** Write the spec as `<loadout>,-<id>,+<id>` (for example `full,-section:office-hours/second-opinion`) and pass the flags `bin/gstack-modules --help` lists.
 
 <a id="module-unknown"></a>
 ### `MODULE_UNKNOWN: "<id>" is not a module`