feat: idd-verify diff-freshness gate — refuse stale-snapshot aggregate#253
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…gate (#228) Records FROZEN_SHA when the diff is frozen (PR head oid in PR mode); Step 2.9 compares it against current HEAD before merge/aggregate — mismatch refuses the aggregate and requires re-freeze + a delta review round. Adds the normative in-flight discipline sentence (no mid-verify commits; accumulate to round end), promoting the DA-CRIT-1 incident handling to mechanism. New drift-guard, 10 assertions (RED→GREEN). Refs #228
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Refs #228
Summary
Diff-freshness gate for
idd-verify(from cluster-verify DA-CRIT-1 live incident):FROZEN_SHArecorded at diff-freeze, compared against current HEAD before merge/aggregate — mismatch refuses the aggregate and requires re-freeze + delta round. Normative discipline sentence added: no mid-verify commits, fixes accumulate to round end.Checklist
Generated by /idd-all (focused batch drain). Do NOT add a GitHub close trailer — IDD discipline requires manual /idd-close after merge.