feat: wire learnings into all insight-producing skills

Adds LEARNINGS_SEARCH and/or LEARNINGS_LOG to 10 skill templates that
produce reusable insights but were previously disconnected from the
learning system:

- office-hours, plan-ceo-review, plan-eng-review: add LOG (had SEARCH)
- plan-design-review: add both SEARCH + LOG (had neither)
- design-review, design-consultation, cso, qa, qa-only: add both
- retro: add SEARCH (had LOG)

13 skills now fully participate in the learning loop (read + write).
Every review, QA, investigation, and design session both consults prior
learnings and contributes new ones.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

qa-only/SKILL.md.tmpl

@@ -49,6 +49,8 @@ mkdir -p "$REPORT_DIR/screenshots"
 
 ---
 
+{{LEARNINGS_SEARCH}}
+
 ## Test Plan Context
 
 Before falling back to git diff heuristics, check for richer test plan sources:
@@ -97,6 +99,8 @@ Report filenames use the domain and date: `qa-report-myapp-com-2026-03-12.md`
 
 ---
 
+{{LEARNINGS_LOG}}
+
 ## Additional Rules (qa-only specific)
 
 11. **Never fix bugs.** Find and document only. Do not read source code, edit files, or suggest fixes in the report. Your job is to report what's broken, not to fix it. Use `/qa` for the test-fix-verify loop.