publishCaptures iterated every session the worker had, with no reference to
whether it still owned the lease. Run 10's task was blocked and unleased for
twenty-six minutes while this called the coordinator every five seconds and
logged "409 Conflict: lease not owned" each time.
The cost was not only the traffic. The single last_error slot stayed pinned to
that dead task, so run 11's own expiry reason was never visible, which is F18
turning a small leak into a blind spot.
A capture is lease-scoped. holdsLease names that invariant so the guard is
testable, rather than inline where a stub backend makes the test vacuous.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CVbaKucEYBjMqVeUgJUsc1
kami
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