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/skill-validation.test.ts

@@ -7,14 +7,13 @@ import * as path from 'path';
 
 const ROOT = path.resolve(import.meta.dir, '..');
 
-// Carved-skill aware (v2 plan T9): ship is a skeleton SKILL.md + sections/*.md.
-// Read the union so validations of content that moved into a section still hold.
-// `_SHIP_MD` is a distinct path expression so a mechanical read-replace can't
-// recurse into this helper.
-const _SHIP_MD = path.join(ROOT, 'ship', 'SKILL.md');
-function readShipUnion(): string {
-  let t = fs.readFileSync(_SHIP_MD, 'utf-8');
-  const secDir = path.join(ROOT, 'ship', 'sections');
+// Carved-skill aware (v2 plan T9 / Phase B): a carved skill is a skeleton SKILL.md
+// plus sections/*.md. Read the union so validations of content that moved into a
+// section still hold. For an uncarved skill (no sections dir) this is just the
+// skeleton, so readSkillUnion is safe to use everywhere.
+function readSkillUnion(skill: string): string {
+  let t = fs.readFileSync(path.join(ROOT, skill, 'SKILL.md'), 'utf-8');
+  const secDir = path.join(ROOT, skill, 'sections');
   if (fs.existsSync(secDir)) {
     for (const f of fs.readdirSync(secDir).sort()) {
       if (f.endsWith('.md')) t += '\n' + fs.readFileSync(path.join(secDir, f), 'utf-8');
@@ -22,6 +21,9 @@ function readShipUnion(): string {
   }
   return t;
 }
+function readShipUnion(): string {
+  return readSkillUnion('ship');
+}
 
 describe('SKILL.md command validation', () => {
   test('all $B commands in SKILL.md are valid browse commands', () => {
@@ -548,8 +550,8 @@ describe('TODOS-format.md reference consistency', () => {
 
   test('skills that write TODOs reference TODOS-format.md', () => {
     const shipContent = readShipUnion();
-    const ceoPlanContent = fs.readFileSync(path.join(ROOT, 'plan-ceo-review', 'SKILL.md'), 'utf-8');
-    const engPlanContent = fs.readFileSync(path.join(ROOT, 'plan-eng-review', 'SKILL.md'), 'utf-8');
+    const ceoPlanContent = readSkillUnion('plan-ceo-review'); // carved: TODOS-format ref moved to section
+    const engPlanContent = readSkillUnion('plan-eng-review');
 
     expect(shipContent).toContain('TODOS-format.md');
     expect(ceoPlanContent).toContain('TODOS-format.md');
@@ -912,8 +914,10 @@ describe('CEO review mode validation', () => {
   });
 
   test('has docs/designs promotion section', () => {
-    expect(content).toContain('docs/designs');
-    expect(content).toContain('PROMOTED');
+    // Carved (v2 plan Phase B): the promotion block moved into the review section.
+    const union = readSkillUnion('plan-ceo-review');
+    expect(union).toContain('docs/designs');
+    expect(union).toContain('PROMOTED');
   });
 
   test('mode quick reference has four columns', () => {