Module sign 

Ed25519 signing of manifest envelopes (ADR-025 key type).

Functions

key_id_for

Default key id for a public key: ed25519: plus the first 16 hex chars of its BLAKE3 hash.

sign_envelope

Append a signature by key under key_id. Re-signing with a key that already signed replaces that entry, so the operation is idempotent.

signing_key_from_hex

Load a signing key from a 64-char lower-case hex seed (surrounding whitespace allowed, as written by weaver workload keygen).