- KG: HNSW + BM25 + RRF(k=60) hybrid search via SurrealDB 3 native indexes - Fix schema bug: kg_executions missing agent_role/provider/cost_cents (silent empty reads) - channels: on_agent_inactive hook (AgentStatus::Inactive → Message::error) - migration 012: adds missing fields + HNSW + BM25 indexes - docs: ADR-0036, update ADR-0035 + notification-channels feature doc