The reconciler doesn't take the RPC layer's per-app FIFO op lock (known
limit of 891cbba4): between a restart worker's stop and start halves it saw
the mempool frontend "missing", repair-recreated it behind systemd's back,
killed the worker's fresh container 11s after start, and left the unit down
for ~3.5 min until the next heal — gate test 123 measured exactly that
window (.228 iteration 3, 2026-07-09).
New crate::app_ops module owns the op-lock registry + stack member table
(runtime.rs and dependencies.rs now delegate) so the reconciler can probe
lifecycle_op_in_flight(app_id) — covering both the app's own key and its
owning stack package — and skip that app for the cycle. The ownership-sweep
podman restart gets the same guard. Health monitor is a follow-up.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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