4.6.0+ with zod ≥ 4.4: every run completion waits a fixed 6 s (cancels 31 s) because FLUSH/CANCEL IPC acks are rejected

4.6.0+ with zod ≥ 4.4: every run completion waits a fixed 6 s (cancels 31 s) because FLUSH/CANCEL IPC acks are rejected #30214