The process hands an event of the seat mesh-broker to BindingsView.Hold, which
applies and acknowledges it after the answer or past the bound, so a restart
finds it delivered again (one delivered again while held keeps its place by its
stream sequence). Unit rows: the answer's bucket differs from the held created's
and the held event's stands. Whole test: an answer that lists a binding dropped
since its ask does not write it back (fails without the check). Neutral caller
name in the by-hand asks.
Builds: design 25 bindings-first-view §3, §4, §8 (hq d0760629, PR 543)
Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ
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