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/tests/lib/doc-consistency.test.mjs

@@ -80,7 +80,7 @@ test('commands/trekexecute.md still parses v1.7 plan schema', () => {
 
 test('settings.json has only known top-level scopes after Spor 0 cleanup', () => {
   const cfg = JSON.parse(read('settings.json'));
-  const known = ['trekplan', 'trekresearch'];
+  const known = ['trekplan', 'trekresearch', 'trekrevise'];
   for (const k of Object.keys(cfg)) {
     assert.ok(known.includes(k), `Unknown top-level scope in settings.json: ${k}`);
   }