Jesse Vincent f8f87ff43a fix(brainstorm-server): address adversarial review findings ...

From a two-reviewer adversarial pass:

- [High] EADDRINUSE fallback clobbered the shared .last-port: onListen wrote the
  bound port unconditionally, so a fallback to a random port overwrote the
  preferred port another live session still owns — stranding that session's open
  tab forever. Now persist only when we bound the preferred port (not on
  fallback). The fallback test now asserts .last-port integrity (teeth-verified).

- [Medium] maybeOpenBrowser ran the URL through a shell (exec + JSON.stringify),
  which does NOT neutralize $(...) in a url-host. Platform launchers now use
  execFile with the URL as an argv element (no shell). The operator-set
  BRAINSTORM_OPEN_CMD path stays shell-based (trusted input).

- [Medium] --open was a silent no-op on native Windows (no win32 branch). Added.

- [Medium] helper.js reconnect/status/tombstone had only substring-grep tests.
  Added behavioral tests driving the state machine against a mocked browser:
  Reconnecting+backoff (500->1000->2000), tombstone after the grace period, and
  reload-on-recovery.

- [Low] status pill showed a false 'Connected' before the socket opened; now
  starts 'Connecting…' until onopen.

Not changed (flagged): stop-server.sh's PID-ownership check still matches any
'node ... server.cjs' (narrow residual — a recycled PID onto an unrelated node
server.cjs); robust fix needs fragile cross-platform process introspection.

2026-06-09 15:59:59 -07:00

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