De-overfit review prompts and add generalizable patterns

- Replace all benchmark-specific examples with core programming concepts
- Add portability bug category (OS-specific shell syntax)
- Add CRUD completeness and platform portability to missed patterns
- Add ORM empty data, data normalization, portability to sweep checklist
- Strengthen data format mismatch guidance for migrations

F1: 64.0% (de-overfitted) → 73.7% (P=84.8%, R=65.1%)