feat(canonical): RFC 8785 (JCS) canonicalization#25
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Add ca2a_runtime.canonical.canonicalize implementing the JSON Canonicalization Scheme for the value types cA2A signs (objects, arrays, strings, integers, booleans, null): UTF-16 key ordering, JCS minimal string escaping, non-ASCII emitted literally as UTF-8, shortest-decimal integers, floats rejected. Credential and provenance bodies are now signed over the JCS encoding via canonical_bytes, so cA2A signatures are cross-verifiable with agent-manifest. ASCII credentials are byte-identical to the previous encoding, so existing signatures and the committed example chain still verify. Suite: 99 passed. Closes #17 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
ca2a_runtime.canonical.canonicalizeimplements RFC 8785 (JSON Canonicalization Scheme) for the value types cA2A signs. Credential and provenance bodies are now signed over the JCS encoding, so cA2A signatures are cross-verifiable with agent-manifest.examples/minimal/chain.jsonstill verify.Suite: 99 passed, 99% coverage.
Closes #17
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