AnswerSeat checks a call's caller against the seat's definition its caller
reads from the seat list it follows (A-186). The bus module's keeper hands
it the mesh-broker definition its seat list holds once heard; mesh-recovery,
which followed none, follows one over its connection and an event hub, read
again once its events are live, and its manifest and its process invoke
seat-definitions and consume the list's two events. Its whole test answers
the seat list.
Builds: design 47 G lead answers A-179, A-186 (join 11 area 6)
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
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