Module parse 

SP-capability-v2 Phase B.1 — JWT compact-form structural decoder.

Parses a UCAN-lite token (<header>.<payload>.<signature>) into a UcanPayload. Does not verify the signature — that’s Phase B.2 (ucan::verify::verify_chain). Pure structural validation: alg / typ / ucv / cmd / DID-method-prefix only.

Spec: docs/archive/superpowers/specs/2026-05-11-sp-capability-v2-design.md §4.1, §4.3, §4.4, §4.5

Functions

parse_jwt

Decode a JWT compact-form UCAN-lite token into its payload.