feat(voyage): add commands/trekrevise.md — 7th pipeline command + settings.json scope — v4.2 Step 6 [skip-docs]

Implements Phase 1-8 of /trekrevise (Handover 8 producer):
- Phase 1: parse mode + reject MULTI_ARTIFACT_NOT_SUPPORTED
- Phase 2: read source + check stale .local.bak
- Phase 3: parseAnchors + validateAnchorPlacement (no partial revisions)
- Phase 4: computeAnnotationDigest + non-additive detection
- Phase 5: revisionGuard orchestration (backup -> mutate -> validate -> rollback-on-fail)
- Phase 6: branch on outcome (applied / rolled-back / mutator-failed)
- Phase 7: optional review-gate (advisory, no auto-rollback)
- Phase 8: trekrevise-stats.jsonl + report

Frontmatter: name=trekrevise, model=opus, allowed-tools includes Read/Write/Edit/Bash/Grep/Glob.
Reuses lib/parsers/anchor-parser, lib/parsers/annotation-digest,
lib/util/markdown-write, lib/util/revision-guard, lib/validators/{brief,plan,review}.

settings.json: register new top-level scope trekrevise with
trekrevise-stats.jsonl tracking (mirrors trekplan/trekresearch shape).

Forward-pinning to keep doc-consistency invariants green:
- tests/lib/doc-consistency.test.mjs: known-scopes allowlist += trekrevise
- CLAUDE.md commands table: add /trekrevise row

Plan Step 13 owns the full README/CLAUDE.md/CHANGELOG content sync;
this commit is the implementation milestone, not the doc milestone.

Refs plan.md Step 6 + plan-critic M3.

plugins/voyage/CLAUDE.md

@@ -15,6 +15,7 @@ Voyage — a contract-driven Claude Code pipeline: brief, research, plan, execut
 | `/trekplan` | Plan — brief-reviewer, explore, plan, review. Requires `--brief` or `--project`. Auto-discovers `architecture/overview.md` if present | opus |
 | `/trekexecute` | Execute — disciplined plan/session-spec executor with failure recovery | opus |
 | `/trekreview` | Review — independent post-hoc review of delivered code against the brief. Produces `review.md` with severity-tagged findings (Handover 6) | opus |
+| `/trekrevise` | Revise — apply operator annotations from the playground back into brief/plan/review with audit trail (Handover 8). Requires `--project` | opus |
 | `/trekcontinue` | Continue — resumes the next session of a multi-session voyage project. Reads `.session-state.local.json` (Handover 7) and immediately begins executing | opus |
 | `/trekendsession` | End-session — mark the current session complete and write session-state pointing at the next session. Helper for informal multi-session flows | sonnet |