teardownSshConnection closed the tunnel and SSH transport but never
killed the detached serve --isolated process. Spawn uses setsid/nohup,
so the backend reparents to pid 1, keeps state.db open, and accumulates
across Cmd+Q. Reuse cleanupStale via disconnect while SSH can still
exec, sequence remote kill before close, and seal the bootstrap
coordinator so reconnect during a prevented first quit cannot respawn.
The quit race is 6s to cover cleanupStale's 5s wait-for-exit loop.
The SSH modules predate the stricter lint config that landed on main (curly, no-empty, perfectionist sorting, prettier). Mechanical lint:fix + fmt pass, empty catch blocks filled with the codebase's void-0 convention, and inline no-control-regex disables on the three deliberate control-char patterns (same pattern as lib/ansi.ts).
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