fix: add LEARNINGS_SEARCH + LEARNINGS_LOG to 6 skills missing them

[Gonzih]

Summary

autoplan, benchmark, canary, health, document-release, and land-and-deploy all perform complex multi-step analysis but were not wired into the gstack institutional memory system.

• 7 skills (investigate, review, qa, cso, ship, retro, plan-*) already had {{LEARNINGS_SEARCH}} + {{LEARNINGS_LOG}}
• 6 skills (the ones above) silently bypassed it entirely
• This means: learnings from past benchmark/canary/deploy runs were never surfaced or persisted

Each skill gets:

• {{LEARNINGS_SEARCH}} after initial setup — surfaces relevant learnings before starting analysis
• {{LEARNINGS_LOG}} before Important Rules — persists new learnings at completion

Placement rationale

Skill	LEARNINGS_SEARCH placement	LEARNINGS_LOG placement
autoplan	Before Phase 1 CEO review	Before Important Rules
benchmark	After Phase 1 setup, before page discovery	Before Important Rules
canary	After Phase 1 setup, before baseline capture	Before Important Rules
health	After Step 1 detect, before running tools	Before Important Rules
document-release	After Step 1 pre-flight, before per-file audit	Before Important Rules
land-and-deploy	After Step 1 pre-flight, before Step 1.5 dry-run	Before Important Rules

Test plan

• bun run gen:skill-docs regenerates all 6 files without errors
• Static skill validation passes (550 tests)
• Invoke /benchmark <url> and verify learnings are searched and persisted
• Invoke /health and verify same

🤖 Generated with Claude Code