release: v3.20.7 - Addy Osmani spec-writing integration

Version Bump:
- VERSION: 3.20.6 → 3.20.7
- CHANGELOG.md: New [3.20.7] section with Osmani integration details
- Synced across: README.md, cheatsheet.md, ultimate-guide.md, reference.yaml

Release Highlights:
- Addy Osmani spec-writing evaluation (4/5, High Value)
- 4 new sections in spec-first.md (Modular Design, Operational Boundaries, Command Templates, Anti-Monolithic)
- 180 lines added to spec-first.md (327 → 507)
- 8 new reference.yaml entries
- 1 new resource evaluation (36 total)

Integration Details (see CHANGELOG.md):
- Modular spec design pattern (split >200 line CLAUDE.md files)
- Always/Ask First/Never operational boundaries framework
- Command spec templates with error handling
- Anti-pattern: monolithic CLAUDE.md context pollution

Landing Sync: Ready for deployment (version updated in separate commit)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

machine-readable/reference.yaml

@@ -3,7 +3,7 @@
 # Source: guide/ultimate-guide.md
 # Purpose: Condensed index for LLMs to quickly answer user questions about Claude Code
 
-version: "3.20.6"
+version: "3.20.7"
 updated: "2026-02-01"
 
 # ════════════════════════════════════════════════════════════════
@@ -924,7 +924,7 @@ ecosystem:
       - "Cross-links modified → Update all 4 repos"
     history:
       - date: "2026-01-20"
-        event: "Code Landing sync v3.20.6, 66 templates, cross-links"
+        event: "Code Landing sync v3.20.7, 66 templates, cross-links"
         commit: "5b5ce62"
       - date: "2026-01-20"
         event: "Cowork Landing fix (paths, README, UI badges)"