Summarizes 8 issues found in code review:
- 3 dead code (module exists but never called)
- 3 feature conflicts (parallel race, override missing)
- 2 data errors (placeholder never replaced)
Establishes 5 prevention rules:
1. New module → verify call chain (who instantiates, who calls)
2. Parallel feature → check shared mutable state
3. Placeholder → must have TODO comment
4. New feature → check interaction with all existing features
5. Review order: call chain → parallel safety → data truth → combinations
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
