Result Log 2026-03-10 14:38 CST

Scope

Prototype and validate a persistent-session stdio worker bridge inside the hot supervisor.
Replace the previously failing reconnect-per-call stdio idea with the persistent-session design that already passed experiment probes.

WorkerSupervisor now defaults hot mode to WMCP_HOT_WORKER_TRANSPORT=stdio-persistent.
Added PersistentStdioWorkerBridge in src/windows_mcp/dev_hot.py.
WorkerSupervisor.call_tool_sync() now routes forwarded worker calls through the persistent stdio bridge when hot mode uses the new default.
WorkerSupervisor.health_snapshot() now exposes active_worker_transport.
Added unit coverage for:
- persistent stdio bridge dispatch
- persistent stdio bridge shutdown

Targeted tests: tests/test_dev_hot.py passed.
Local hot shell via build_shell_mcp(...):
- Clipboard(get): pass
- long forwarded PowerShell with Start-Sleep -Seconds 8: pass
- DevServer(mode="health"): pass and reported active_worker_transport = "stdio-persistent"
Full suite: 168 passed in 5.58s

The earlier stdio failure was a session-lifecycle bug, not a transport dead end.
Persistent-session stdio is now the best-supported local replacement for the unreliable internal worker streamable-http bridge.
Live verification still requires one more host reconnect because the currently attached shell was started before this transport default changed.