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>

README.md

@@ -485,7 +485,7 @@ See [CONTRIBUTING.md](./CONTRIBUTING.md) for guidelines.
 
 ---
 
-*Version 3.20.6 | February 2026 | Crafted with Claude*
+*Version 3.20.7 | February 2026 | Crafted with Claude*
 
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