feat(#247): runtime-neutral phase uat-passed predicate from HUMAN-UAT results (#1063)

* feat(#247): runtime-neutral phase uat-passed predicate from HUMAN-UAT results

Wire the already-reserved `phase.uat-passed` alias (subcommand `uat-passed`,
mutation:false) into the phase command router with a new markdown-aware
predicate that evaluates HUMAN-UAT results and reports pass only when every
required check passes. Post-SDK-retirement (ADR-0174/#174) successor to the
SDK-framed #70, with no SDK-specific API surface.

New pure module src/uat-predicate.cts:
- stripFalsePositiveContexts: frontmatter -> HTML-comment -> CommonMark-style
  fenced-block state machine (tracks delimiter char+length) -> blockquote,
  each a small composable step, so a `result: passed` inside frontmatter, a
  fenced/~~~ block (incl. ~~~ nested in a ``` fence), a comment, or a
  blockquote is never counted.
- parseUatResultItems: heading-block parser, column-0-anchored same-line
  result; a heading with no result -> `missing` (fail-closed).
- analyzeMarkdown: unterminated fence/comment detection (malformed -> blocker).
- evaluateUatPassed: allowlist pass/verification semantics; passed = no
  blockers && >=1 check && all passing; no_uat_artifacts discriminator (no
  vacuous pass); optional requireVerification policy hook.

Thin cmdPhaseUatPassed handler in phase.cts; router closure rejects unknown
flags via makeInvalidArgs. Hardened across two Codex adversarial passes
(vacuous pass, dropped failing tests, permissive verification status,
nested-fence escape, cross-line result value, masked unterminated comment) —
all fixed fail-closed. New unit + CLI-integration suites incl. a fast-check
property test; docs, CONTEXT glossary, inventory, and changeset updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore(#247): backfill changeset PR number (#1063)

* fix(#247): indexOf paired-scan for unterminated-comment detection

CodeQL js/incomplete-multi-character-sanitization (high) flagged the
`raw.replace(/<!--[\s\S]*?-->/g,'')`-then-`.includes('<!--')` detection in
analyzeMarkdown as incomplete sanitization (a single regex pass can leave a
residual `<!--`). Replace it with a paired left-to-right indexOf scan that
contains no `.replace()` of the comment token — CodeQL-clean and strictly
more correct (a closed earlier comment can never mask a later unterminated
one). Behaviour unchanged; 98 predicate tests + scoped docker run green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

docs/INVENTORY.md

@@ -371,7 +371,7 @@ The `gsd-planner` agent is decomposed into a core agent plus reference modules t
 
 ---
 
-## CLI Modules (105 shipped)
+## CLI Modules (106 shipped)
 
 Full listing: `gsd-core/bin/lib/*.cjs`.
 
@@ -468,6 +468,7 @@ Full listing: `gsd-core/bin/lib/*.cjs`.
 | `task-command-router.cjs` | Thin CJS subcommand router adapter for `gsd-tools task` |
 | `template.cjs` | Template selection and filling with variable substitution |
 | `uat.cjs` | UAT file parsing, verification debt tracking, audit-uat support |
+| `uat-predicate.cjs` | UAT-passed predicate — markdown-aware evaluation of HUMAN-UAT results; returns pass only when all required checks pass; ignores false-positive contexts (frontmatter, fenced code, blockquotes, HTML comments) |
 | `ui-safety-gate.cjs` | Shell-free word-boundary UI token detector (#3706, #3718); reads phase-section text from stdin, exits 0 (UI found) or 1 (no UI); also deployed to `gsd-core/bin/lib/` so the GSD installer ships it to `$RUNTIME_DIR` (#448) |
 | `update-context.cjs` | Pure install-context resolver for `/gsd:update` — runtime/scope/config-dir/version detection (LOCAL/GLOBAL/UNKNOWN) ported from update.md bash; backs `gsd-tools update-context` (#498) |
 | `validate-command-router.cjs` | Thin CJS subcommand router adapter for `gsd-tools validate` |