stacklok / toolhive / 23749352567

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Treat PID 0 as dead in supervisor liveness check (#4431)

Treat PID 0 as dead in isSupervisorProcessAlive

During transport restart, ResetWorkloadPID sets process_id to 0 in
the status file. isSupervisorProcessAlive only checked for an error
from GetWorkloadPID, so (0, nil) was treated as a live supervisor.
This caused thv restart to silently no-op during the transient
window where PID is 0.

Fixes #4429

Signed-off-by: Greg Katz <gkatz@indeed.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Muhammad Amir Ejaz <amir@stacklok.com>

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