End-to-end W3C alignment with backward-compatible coexistence of the
legacy v0.x JWS API. New W3C Verifiable Credentials issuance, Data
Integrity proofs (eddsa-jcs-2022), Multikey verification methods, and
optional hybrid Ed25519 + ML-DSA-44 post-quantum profile aligning with
NIST CNSA 2.0 / NSM-10 timelines. Three-language reference
implementation (Python, TypeScript, Go) with byte-identical canonical
form verified against shared RFC 8785 JCS test vectors.