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f057b4a30b
The companion shut down after only 30 minutes idle — too short for real brainstorming, where a single question can sit far longer. And shutdown() never closed upgraded WebSocket sockets, so an open browser connection could keep the Node process alive after it was supposed to exit. - Default idle timeout raised to 4 hours, configurable via BRAINSTORM_IDLE_TIMEOUT_MS and start-server.sh --idle-timeout-minutes (validated positive integer). - Reported as idle_timeout_ms in the server-started JSON / server-info. - shutdown() now destroys all client sockets so the process exits even with an open WebSocket. - Watchdog check interval is configurable (BRAINSTORM_LIFECYCLE_CHECK_MS, default 60s) so the lifecycle can be tested without minute-long waits. Adds lifecycle.test.js (configured timeout reported; idle shutdown exits despite an open WS — teeth-verified; the start-server flag). Wires ws-protocol, lifecycle, and stop-server suites into npm test. Closes #1237 Refs #1689