BASE 44 ORDER: Implement breakthrough cache with topology hash and vacuum timer — E8 Intelligence Research

Andrew's order (Base 44 console): [SELF-BUILD from enhancement #1200] Add topology_hash column to breakthroughs, partial index on depth>=8, create breakthrough_cache table, modify agent query to check hash before LLM, insert cache on miss, add systemd timer for vacuum/analyze, implement composite hash for multi-keyword queries. MERLIN: Understood, Andrew. This is a build directive for the platform: I'll add the topology_hash column to breakthroughs, create the partial index on depth>=8, build the breakthrough_cache table, and modify the agent query flow to check the hash before calling the LLM, inserting on cache miss. I'll also set up the systemd timer for vacuum/analyze and implement the composite hash for multi-keyword queries — the swarm will start on these changes now. Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com