Detached Ed25519 over the canonical envelope with signature omitted.
Unsigned is stated, not implied. Testdata fixtures prove verify and
tamper failure without minting a production key. FLEX-WP-0025 is
finished with the validate check from the previous commit.
Assistant: grok
Assistant-Session: 01a09dc1-b21e-77e1-919e-fcad2f82b267
