Add Comprehensive Wycheproof Test Integration

[kevinamccorvon]

We have some coverage but it's patchy. Need systematic integration across all algorithms.

Coverage needed:

• AEAD: AES-GCM, AES-GCM-SIV, AES-CCM, AES-EAX, AES-OCB3, ChaCha20-Poly1305
• Signatures: ECDSA, EdDSA, Schnorr, RSA-PSS
• Curves: P-256, P-384, P-521, secp256k1, Ed25519, Ed448

Action items:

• Build test harness for Wycheproof integration
• Document expected failures (if any)
• Hook into CI pipeline