Collaboration: comparing OAP spec with Agent Passport System v1.1

Hi! We've been building in the same space — our [Agent Passport System](https://github.com/aeoess/agent-passport-system) also provides verifiable agent identity and pre-action authorization.

Our implementation includes:
- Ed25519 self-sovereign identity (no CA/registry)
- Delegation chains with depth limits and scope narrowing
- Signed action receipts with Merkle tree attribution
- Human Values Floor (ethical commitments manifest)
- Revocation with cascade
- 46 passing tests, TypeScript, zero external deps

Full spec: https://github.com/aeoess/agent-passport-system/blob/main/docs/SPEC-v1.1.md

Would love to compare approaches. The space benefits from convergence rather than fragmentation.