refactor(plan-ceo-review): carve review body into on-demand section

Carve the largest skill (138,838 B) into a skeleton + one on-demand
section, the documented next Phase B target after /ship (v2_PLAN.md:216).

- sections/review-sections.md(.tmpl): the 11-section deep review, codex/
  outside-voice rules, how-to-ask, Required Outputs, registries, Completion
  Summary, Review Log, REVIEW_DASHBOARD, PLAN_FILE_REVIEW_REPORT, Next Steps,
  docs/designs promotion, Formatting Rules, and the Mode Quick Reference.
- sections/manifest.json: passive registry (CM2), one entry.
- SKILL.md.tmpl: {{SECTION_INDEX}} after the system audit, a single
  {{SECTION:review-sections}} STOP-Read after Step 0 mode selection, and a
  Section self-check. All of Step 0 (the scope/mode conversation) stays in
  the always-loaded skeleton; only EXIT_PLAN_MODE_GATE follows the section.

Measured: always-loaded skeleton 138,838 -> 80,731 B (-42%, ~14.4K tokens
off every invocation). Union (skeleton + section) 139,110 B, behavior held.

Boundary honors Codex P1: nothing review-governing (formatting rules, mode
reference, how-to-ask, required outputs) sits in the skeleton below the
STOP. Housekeeping resolvers ride in the section, matching the ship
precedent (adversarial.md carries LEARNINGS_LOG + GBRAIN_SAVE_RESULTS).

Tests (atomic with the carve — skill-docs.yml gates gen:skill-docs
freshness on every push, so source + regen + tests must land together):
- parity-harness: plan-ceo flipped to sectioned, maxSkeletonBytes 90_000
  (measured 80,731 + headroom); content/minBytes run against the union.
- skill-size-budget: plan-ceo-review added to SECTIONS_EXTRACTED.
- section-manifest-consistency: generalized to discover every carved skill,
  vars computed per-skill-case (Codex P2).
- skill-ceo-section-ordering (new, gate): per-PR static guard — STOP after
  Step 0, review body absent from skeleton, report writer in the section,
  nothing review-governing below the STOP.
- skill-e2e-plan-ceo-review-section-loading (new, periodic): refreshes the
  installed skill first (Codex P1), drives full Step 0, asserts the section
  is Read before the report.
- gen-skill-docs + skill-validation: read the skeleton+sections union for
  carved skills so relocated prose still counts.
- touchfiles: plan-ceo-section-loading registered (periodic).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

test/gen-skill-docs.test.ts

@@ -672,7 +672,7 @@ describe('REVIEW_DASHBOARD resolver', () => {
 
   for (const skill of REVIEW_SKILLS) {
     test(`review dashboard appears in ${skill} generated file`, () => {
-      const content = fs.readFileSync(path.join(ROOT, skill, 'SKILL.md'), 'utf-8');
+      const content = readSkillUnion(skill); // carved skills: union skeleton + sections
       expect(content).toContain('gstack-review');
       expect(content).toContain('REVIEW READINESS DASHBOARD');
     });
@@ -699,7 +699,7 @@ describe('REVIEW_DASHBOARD resolver', () => {
   });
 
   test('resolver output contains key dashboard elements', () => {
-    const content = fs.readFileSync(path.join(ROOT, 'plan-ceo-review', 'SKILL.md'), 'utf-8');
+    const content = readSkillUnion('plan-ceo-review'); // carved: dashboard moved to section
     expect(content).toContain('VERDICT');
     expect(content).toContain('CLEARED');
     expect(content).toContain('Eng Review');
@@ -709,25 +709,25 @@ describe('REVIEW_DASHBOARD resolver', () => {
   });
 
   test('dashboard bash block includes git HEAD for staleness detection', () => {
-    const content = fs.readFileSync(path.join(ROOT, 'plan-ceo-review', 'SKILL.md'), 'utf-8');
+    const content = readSkillUnion('plan-ceo-review'); // carved: dashboard moved to section
     expect(content).toContain('git rev-parse --short HEAD');
     expect(content).toContain('---HEAD---');
   });
 
   test('dashboard includes staleness detection prose', () => {
-    const content = fs.readFileSync(path.join(ROOT, 'plan-ceo-review', 'SKILL.md'), 'utf-8');
+    const content = readSkillUnion('plan-ceo-review'); // carved: dashboard moved to section
     expect(content).toContain('Staleness detection');
     expect(content).toContain('commit');
   });
 
   for (const skill of REVIEW_SKILLS) {
     test(`${skill} contains review chaining section`, () => {
-      const content = fs.readFileSync(path.join(ROOT, skill, 'SKILL.md'), 'utf-8');
+      const content = readSkillUnion(skill); // carved skills: union skeleton + sections
       expect(content).toContain('Review Chaining');
     });
 
     test(`${skill} Review Log includes commit field`, () => {
-      const content = fs.readFileSync(path.join(ROOT, skill, 'SKILL.md'), 'utf-8');
+      const content = readSkillUnion(skill); // carved skills: union skeleton + sections
       expect(content).toContain('"commit"');
     });
   }
@@ -969,7 +969,7 @@ describe('PLAN_FILE_REVIEW_REPORT resolver', () => {
   }
 
   test('resolver output contains key report elements', () => {
-    const content = fs.readFileSync(path.join(ROOT, 'plan-ceo-review', 'SKILL.md'), 'utf-8');
+    const content = readSkillUnion('plan-ceo-review'); // carved: report writer moved to section
     expect(content).toContain('Trigger');
     expect(content).toContain('Findings');
     expect(content).toContain('VERDICT');
@@ -3112,7 +3112,9 @@ describe('GSTACK REVIEW REPORT delete-then-append flow', () => {
 
   for (const skill of PLAN_REVIEW_SKILLS) {
     test(`${skill}/SKILL.md prescribes delete-then-append, not in-place replace`, () => {
-      const content = fs.readFileSync(path.join(ROOT, skill, 'SKILL.md'), 'utf-8');
+      // Carved skills (v2 plan Phase B) relocate the review-report prose into
+      // sections/*.md; readSkillUnion follows the content wherever the carve put it.
+      const content = readSkillUnion(skill);
 
       // The new (correct) instruction must be present.
       expect(content).toContain('delete-then-append flow');