feat: per-user auto-memory with ResponseContext
Three memory channels: hidden tool (sol.memory.set/get in scripts), pre-response injection (relevant memories loaded into system prompt), and post-response extraction (ministral-3b extracts facts after each response). User isolation enforced at Rust level — user_id derived from Matrix sender, never from script arguments. New modules: context (ResponseContext), memory (schema, store, extractor). ResponseContext threaded through responder → tools → script runtime. OpenSearch index sol_user_memory created on startup alongside archive.
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