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The infra VM is a per-host singleton that outlives short-lived launchers, so
`ensure_running` adopts it when its control plane is healthy. But it adopted
ANY healthy VM regardless of the code that built it — so after an infra-code
change the old VM kept being adopted and the new code never booted. The only
way to dislodge it was an out-of-band `kill`, which then raced whatever
launched next. On CI this meant every infra change needed a manual VM kill.
Make adoption version-aware:
* boot records the infra-artifact version it booted from in a `booted-version`
marker beside the singleton; `stop` clears it.
* `ensure_running` adopts only when the marker matches the current version
(`_adoptable`); a missing/mismatched marker falls through to stop + reboot.
So a stale VM is replaced automatically on the next launch — no manual kill,
and it's concurrency-safe (the reboot happens under the singleton flock).
Also harden teardown: the PID file drifts after crashes / out-of-band kills,
so `stop` now also reaps any orphaned firecracker still bound to the infra
config path (scoped to that path, so interactive-pool VMs are untouched) —
otherwise a survivor holds the orchestrator TAP and the fresh boot dies with
"tap … Resource busy".
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A9qa3xoavjQScufDfZaXKR