Session 196

Prose pending.

Purpose

K3 — build the persistent DI memory engine (gateway-owned IMemoryEngine singleton; swarm S2 Mnemosyne)

Implement IMemoryEngine persistent engine + DI-register as gateway-owned singleton
Inject engine into MemoryHandler
Wire migrate_to_cold on session-close
Add tests + verify green (ruff/pyright/check-deps)

K3: built the gateway-owned persistent memory engine (SPEC-010 FR-001/FR-008, SPEC-024)
- One MemoryEngine singleton built in WebSocketGateway._register_memory_engine(), registered as IMemoryEngine in a gateway DIContainer (register_instance), injected into MemoryHandler (set_engine) + SessionHandler (set_memory_engine) via RPCHandler.set_memory_engine. handle_close migrates the session's hot memories to cold (best-effort, only when engine running). initialize() made idempotent to kill a double-connect leak. Engine stopped in gateway.stop(). All gates green; 862 gateway+memory tests pass.

src/orchestrata_ultimate/gateway/server.py - _register_memory_engine() + DI/engine fields + engine.stop()
src/orchestrata_ultimate/gateway/rpc.py - set_memory_engine() injects singleton into memory + session handlers
src/orchestrata_ultimate/gateway/handlers/memory.py - set_engine() late-binding injection
src/orchestrata_ultimate/gateway/handlers/session.py - set_memory_engine() + migrate_to_cold on close
src/orchestrata_ultimate/memory/memory_engine.py - initialize() idempotent (guards double-connect leak)
tests/gateway/test_memory_engine_wiring.py - 6 new K3 wiring tests
tests/gateway/test_server_integration.py - FIX pre-existing hardcoded http_port 8766 bind conflict (dynamic per test)
tests/memory/test_memory_engine.py - added test_initialize_is_idempotent

K3: gateway builds one MemoryEngine, registers it as IMemoryEngine SINGLETON in a gateway-owned DIContainer (register_instance — both protocols are runtime_checkable so isinstance passes structurally), injects that same instance into MemoryHandler + SessionHandler via new set_* late-binding methods. handle_close migrates_to_cold (best-effort, only when engine already running). MemoryEngine.initialize made idempotent.: Matches session-195 topology decision (gateway-owned singleton) + existing set_* injection pattern; idempotent initialize prevents a latent double-connect leak across DI-resolve and handler-lazy-init paths.

K3 (persistent DI memory engine) built, wired, tested, gated, and committed (0ebd6007): gateway-owned IMemoryEngine singleton -> memory RPC + session-close cold migration (SPEC-010 FR-001/FR-008, SPEC-024); idempotent initialize; fixed pre-existing hardcoded-http-port flake; 862 gateway+memory + 141 di/core tests green

Wave-2 P1s: volk personas + per-volk tools; volk<->volk + orchestrator<->volk messaging w/ heartbeat; context injection (SPEC-009 + memory/KG retrieval into volk execution); KG schema audit (008/105)
P2: resolve the agent_id/volk_id memory-naming divergence (one decision, then sweep)

Key decisions: K3 topology = gateway-owned IMemoryEngine singleton (register_instance in a gateway DIContainer), injected into memory + session handlers via set_* late-binding, initialize() made idempotent to prevent double-connect leak across DI-resolve + lazy-init paths
Blockers: None
In-progress: K3 complete + committed (0ebd6007); Wave-1 keystones K1/K2/K4 + K3 all done
Important files: src/orchestrata_ultimate/gateway/server.py (_register_memory_engine), src/orchestrata_ultimate/gateway/handlers/session.py (migrate_to_cold on close), tests/gateway/test_memory_engine_wiring.py
Commands: uv run pytest tests/gateway/ tests/memory/ --timeout=300 -q
Warnings: P2 backlog filed: MemoryEngineProtocol.store(agent_id) vs impl/IMemoryEngine/MemoryEntry(volk_id) DIVERGENCE — pyright flags memory_engine.py:150; needs a canonical-name decision before a sweep, do NOT fix piecemeal