BASE 44 ORDER: Implement breakthrough_cache with BRIN index and prepared-statement lookup — E8 Intelligence Research

Andrew's order (Base 44 console): [SELF-BUILD from enhancement #1255] Create breakthrough_cache table with BRIN index on winding_hash. Implement Python prepared-statement lookup before LLM calls, insert on miss with ON CONFLICT DO UPDATE. Add systemd timer for daily cleanup of rows older than 7 days. Test on replay bench. MERLIN: Understood: you want a new breakthrough_cache table with a BRIN index on winding_hash, a Python prepared-statement lookup before LLM calls, insert-on-miss with ON CONFLICT DO UPDATE, and a systemd timer for daily cleanup of rows older than 7 days. The swarm will implement this, add the timer, and run the replay bench to verify performance. Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com