docs: add resource evaluation system documentation

- Document claudedocs/resource-evaluations/ structure in CLAUDE.md
- Establish scoring methodology (1-5 scale) for external resources
- Create process: analysis → scoring → challenge → decision
- First evaluation: Remotion + Claude Code (2/5, rejected)

Rationale: Systematic tracking of evaluated resources prevents
duplicate analysis and provides audit trail for integration decisions.

Files remain local (claudedocs/ is gitignored).

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

CLAUDE.md

@@ -32,6 +32,10 @@ machine-readable/         # For LLM consumption
 tools/                    # Interactive utilities
 ├── audit-prompt.md       # Setup audit prompt
 └── onboarding-prompt.md  # Personalized learning prompt
+
+claudedocs/               # Claude working documents
+├── resource-evaluations/ # External resource assessments
+└── *.md                  # Analysis reports, plans, working docs
 ```
 
 ## Key Files