fix(ci): bump PHASE_SCOPE assertion to 21 + fix skill-optimizer Anti-Patterns case

Two CI failures pre-existing on this branch since the v0.42.0.0 skillopt
cathedral landed; master is green because skillopt didn't exist there yet.

1. test/phase-scope-coverage.test.ts asserted ALL_PHASES.length === 20.
   skillopt is the 21st phase. Bumped to 21 with v0.42.0.0 history line
   in the comment chain. Sibling fix to the cycle.serial.test.ts bump
   in commit 08ad2468.

2. skills/skill-optimizer/SKILL.md had `## Anti-patterns` (lowercase p).
   skills-conformance.test.ts asserts `## Anti-Patterns` (capital P) as
   the required section header. Single-character rename.

Local: 174 skillopt-surface tests + 6 phase-scope tests + 249 skills-
conformance tests all green. Typecheck clean.

Remaining CI delta: 5 put_page facts backstop failures in shard 10 that
reproduce only on Linux CI, not locally even with empty env / cleared
HOME / max-concurrency=1. The error surface is `r.isError === true` with
no further detail captured in the bun:test output. Pushing these 2 fixes
first to narrow the CI signal; will instrument if the 5 persist.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

skills/skill-optimizer/SKILL.md

@@ -89,7 +89,7 @@ When invoked, this skill produces:
 - `skills/<name>/skillopt/rejected.json` — bounded LRU of rejected edits
 - `~/.gbrain/audit/skillopt-YYYY-Www.jsonl` — ISO-week-rotated audit trail
 
-## Anti-patterns
+## Anti-Patterns
 
 - **Don't bypass the validation gate.** The median-of-3 + epsilon=0.05 is
   load-bearing; without it, the optimizer accepts noise as improvement.

test/phase-scope-coverage.test.ts

@@ -41,14 +41,15 @@ describe('PHASE_SCOPE coverage', () => {
     expect(invalid).toEqual([]);
   });
 
-  test('all 20 phases covered (regression on accidental omission)', () => {
+  test('all 21 phases covered (regression on accidental omission)', () => {
     // Pin the count so a future PR that adds a phase to ALL_PHASES
     // without updating PHASE_SCOPE notices here too. The v0.39.1.0
     // master merge brought in the 17th phase (`schema-suggest`); v0.41
     // adds 'extract_atoms' + 'synthesize_concepts' (T9 lens packs) +
-    // 'conversation_facts_backfill' (v0.41.11.0) for a total of 20.
-    expect(ALL_PHASES.length).toBe(20);
-    expect(Object.keys(PHASE_SCOPE).length).toBe(20);
+    // 'conversation_facts_backfill' (v0.41.11.0) for 20. v0.42.0.0
+    // adds 'skillopt' (self-evolving skills cycle phase) for a total of 21.
+    expect(ALL_PHASES.length).toBe(21);
+    expect(Object.keys(PHASE_SCOPE).length).toBe(21);
   });
 
   test('embed remains global (the headline brain-wide phase)', () => {