X_IDEMPOTENCY_RUN_CEILING
Means
a keyed run passed its hard ceiling
Typical cause
a keyed handler runs past the request deadline so its replay can answer success, and this one was still running at the ceiling: it was aborted, and the key settled as this failure
Fix
make the call that hung with outbound() from @ultimat3/core/outbound, which the ceiling aborts, or raise the ceiling: configureIdempotency({ scope, ceilingMs: 300_000 }) at boot