The seat list's build seat per artifact (language or kind), a kept call
<seat>.steps with {module, artifact, fingerprint, fetch}, and the finding
call-unanswered (scope call, id <seat>.steps) after five minutes, cleared on an answer.
Builds: design 47 G §704
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h