Jesse Vincent b53c62eba8 feat(brainstorm-server): reuse the same port on session restart ...

When the companion idle-shuts-down and the agent restarts it, a fresh random
port meant the user's open browser tab pointed at a dead URL. Persist the bound
port per project and prefer it on the next start, so the restarted server comes
up on the same port and the open tab's reconnect just works.

- start-server.sh exports BRAINSTORM_PORT_FILE=<project>/.superpowers/brainstorm/
  .last-port for project sessions (not /tmp).
- server.cjs prefers an explicit BRAINSTORM_PORT, else the recorded port, else
  random; writes the actually-bound port back; and on EADDRINUSE (preferred port
  still in use) falls back to a random port once instead of crashing.

lifecycle.test.js: restart reuses the recorded port; a taken preferred port
falls back to a random one without crashing.

Refs #1237

2026-06-09 15:22:23 -07:00

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