Same lesson twice in one night: the toroidal dread applied at every rev and QD3S (recorded flat) refused seq 76 again on restore. rev >= 32 wraps; older vintages measure the flat diamond they were played under. This time verified properly: a strict replay harness (any refused command is a hard failure) ran all 41 production ledgers against the new engine before deploy — 0 failures. That harness now lives in the repo as the pre-deploy determinism check it always should have been. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0138A8CjeQRpvzKxuMfz1Bqc