kanoniv-agent-auth 0.3.0

Sudo for AI agents - cryptographic delegation, Ed25519 identity, and signed audit trails
Documentation 
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## What this PR does

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## Why

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## Checklist

- [ ] All three test suites pass locally (Rust, TypeScript, Python)
- [ ] Cross-language fixtures regenerated if serialization/hashing changed
- [ ] Tests added for new behavior or bug fix
- [ ] No breaking changes to public API (or discussed in an issue first)