Reschedule (C4): switches to mutateWithFallback. PG hits go through
the existing RescheduleTaskRunService (which enforces status ===
"DELAYED"). Buffered hits land a set_delay patch on the snapshot;
the drainer materialises the PG row with the new delayUntil. Synth-
esised response returns { id, delayUntil }.
Replay (C5): adds a read-fallback after the PG miss. The B4-extended
SyntheticRun carries every field ReplayTaskRunService reads from a
TaskRun, so the buffered case casts through and uses the existing
service unchanged. Replay creates a fresh trigger that itself
re-enters the mollifier gate — no special surge handling needed
beyond what the gate already does. Also tightens the PG lookup to
findFirst with runtimeEnvironmentId scoping (was findUnique on
friendlyId only).
Dan Sutton
0183e43677