fix(ssh,host-bin): permanent pooled-client error listener + uncaughtException/unhandledRejection guards

Root cause of the live production crash (exit-1 'Timed out while waiting for
handshake'): the pooled ssh2.Client had no permanent 'error' listener after
connect, so a post-connect ssh2 error escaped as an uncaught EventEmitter
'error' with no process-level guard. See notes/crash-investigation-findings.md §1.

- packages/ssh/src/pool.ts: attach a permanent 'error' listener to the pooled
  client in buildConnection that sets state=error, logs (alias, message, level),
  and does not throw; cleanup() no longer removes it.
- packages/host-bin/src/main.ts: add process.on('uncaughtException') (graceful
  shutdown after logging) and process.on('unhandledRejection') (log + continue),
  both logging message/stack, memory snapshot, activeConversations count, and
  timestamp so the failure site is observable.

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