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Jinwoo-H
34731358c4
c17's canary stopped at the pre-apply predecessor check with `runtime predecessor mismatch fields=draining`. The flag is residue: the previous canary (run 35290908836) drained c17 at 00:26:01, its terraform apply then failed, and the failsafe re-isolates without restarting the VM, so nothing cleared it. The same run had passed this very check a second earlier, which is what proves a parked cell is not draining at rest. Draining means connections are being shed, and a migration-only cell holds none, so the flag is not a precondition there. Accept it on entry for that class only. The replacement VM is still required not to be draining, on every path, and the incarnation check still proves it was replaced. Both predecessor checks now read one decision instead of computing the rule twice, so the assertion and its diagnostic cannot disagree. Every general-cell and rollback path keeps the value it had; a census test runs the real block over all eight mode and class combinations to hold that.