feat: add companion manifest, attestation, and evidence schemas v0#4
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Signed-off-by: Justin Levine <20596508+jal-co@users.noreply.github.com>
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What
Adds the v0 companion manifest, attestation, and evidence JSON Schemas, RFC 0001, a 19-fixture conformance suite (valid/invalid/malicious), Ajv validation tooling, tests, and SHA-pinned CI with a DCO check.
Why
Spec Milestones 0–3 groundwork: the schemas are the contract the core, CLI, and cloud consume, and the first defense against malicious registry payloads.
How
Strict draft-2020-12 schemas (additionalProperties: false, bounded sizes, safe path patterns), conditional source-model requirements, no generic "verified" state, and canonicalization profile named for the attestation digest.
Testing
pnpm validate: 19/19 fixtures match expected outcomespnpm test: 20/20 node:test assertions pass