Refactor Clean

Safely identify and remove dead code with test verification:

Run dead code analysis tools:
- knip: Find unused exports and files
- depcheck: Find unused dependencies
- ts-prune: Find unused TypeScript exports
Generate comprehensive report in .reports/dead-code-analysis.md
Categorize findings by severity:
- SAFE: Test files, unused utilities
- CAUTION: API routes, components
- DANGER: Config files, main entry points
Propose safe deletions only
Before each deletion:
- Run full test suite
- Verify tests pass
- Apply change
- Re-run tests
- Rollback if tests fail
Show summary of cleaned items

Never delete code without running tests first!