feat: add support for C2SP tlog-tiles for public registry #90
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Append-only transparency log foundation: Merkle tree with RFC 6962 domain separation, C2SP tile format (height=8), signed note checkpoints, inclusion/ consistency proofs, offline verification bundles, and filesystem tile store. Includes SDK transparency workflow and CLI artifact verify command.
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…nsparency Add C2SP tlog-witness cosignature protocol implementation: - WitnessClient async trait with submit_checkpoint() method - collect_witness_cosignatures() with concurrent fan-out and early quorum return - Cosignature format: algorithm byte 0x04, 8-byte timestamp + 64-byte Ed25519 sig - compute_witness_key_id() using algorithm byte 0x04 for key ID computation - cosignature_signed_message() per C2SP spec format - Serialization/deserialization helpers for wire format
- Add try_cache_checkpoint() with TOFU semantics: accepts first checkpoint, detects equivocation (same size/different root), rejects smaller sizes - Wire checkpoint caching into artifact verify (bundle path) - Wire checkpoint caching into artifact publish (from bundle in .auths.json) - Cache stored at ~/.auths/log_checkpoint.json
…n-74, fn-75, fn-76) - Namespace SDK workflows: claim, delegate, transfer with Ed25519 signing - Namespace CLI commands: auths namespace claim/delegate/transfer/lookup - Account CLI commands: auths account status/usage - Delegation chain verification supporting variable-length chains - Trust root fetch workflow in auths-sdk - S3 tile store for transparency log (optional feature)
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