VES v1.0 Cryptographic Operations
Implements:
- RFC 8785 JSON Canonicalization Scheme (JCS) via
serde_jcs - Domain-separated hashing per VES spec
- Ed25519 signing for agent signatures
- AES-256-GCM payload encryption (VES-ENC-1)
- X25519 ECDH key wrapping
- Merkle tree hashing