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Item 2 of the semantic-mapping follow-ups. Caching (2a): ControlIndex::load_or_build persists the embedded corpus to snapshot_dir keyed by a corpus hash (control ids + requirement text). A later scan reuses the embeddings unless the catalog changed, turning the per-scan re-embed of the ~13.6k master-control corpus into a one-time cost. Atomic write (temp + rename); self-invalidates on catalog change. ControlCheckSpec gains Serialize/Deserialize to persist. Auto-wire (2b): orchestrator Stage 5c runs semantic_stamp_findings after control triage, gated on breakpilot.semantic_mapping (env BREAKPILOT_SEMANTIC_MAPPING, default off). Stays off until verified live against a deployed master-controls catalog; safe no-op meanwhile (the endpoint 400s pre-deploy and the pass warns + returns 0). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>