- Add bulk_technique_scores() that pre-fetches all scoring data in 5 aggregated GROUP BY queries instead of N*5 per-technique queries
- Rewrite calculate_organization_score to use bulk data (N*5+5 queries -> 10 fixed queries)
- Rewrite calculate_tactic_score and calculate_actor_coverage_score to use bulk data
- Preserve calculate_technique_score single-technique API for router-level calls