Prompt to create support bundle before Reload Window on SSH failure #970

Split out from #955 point (4).

Summary

Detect Remote-SSH failure conditions before users click VS Code's native "Reload Window" prompt, then offer to create a Coder support bundle while volatile state is still available.

Proposed scope

• Watch the actual Remote-SSH extension log for known failure markers:
  • permanent error
  • will give up now
  • Unknown reconnection token
  • socketFactory.connect() failed or timed out
  • Time limit reached
  • UnparsableOutput
• Treat long process-loss/no-recovery windows as a failure signal without firing during normal reconnect cycles.
• Show a notification:
  • Coder: remote session failed and won't auto-reconnect. Capture diagnostics now?
  • Actions: Create support bundle, Dismiss
• Running Create support bundle should invoke the existing coder.supportBundle command.
• Avoid duplicate notifications in a single failing session.

Notes

This is intentionally separate from #955's support bundle collection changes because the current SshProcessMonitor discovers ports/PIDs/proxy-log paths but does not tail or classify log contents. This should be implemented as a lifecycle-safe watcher/detector rather than added opportunistically to bundle collection.

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