The controller's hand-act and warranted are gone (issue 1953 L5b) and the bus refuses them, so the recorder no longer
falls back to them: an act the seat does not take is an error saying nothing was recorded. And ADR 0580 clause 1's
reader is shown reading a build by key each time and a manifest once per digest.
Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL