pub fn decode_compact(
token: &str,
) -> Result<(JwtHeader, JwtClaims, Vec<u8>), JwtError>Expand description
Decode a compact JWT into (header, claims, signature_bytes).
Does NOT verify the signature — use verify_compact for that. This helper
is primarily for test round-tripping and for negative-test assertions
(e.g., “the minted token has the expected alg header”).