The seat's Binding takes the fields the events carry and the membership holds
(local, storage, template, stream, subject, bucket, object-store, history,
state, indexes, snapshot, types): one form in the events, in list, show and
orphans. Held gains binding, present on an entry the bus holds. Definition,
fixture and generated Go and TypeScript contract.
Builds: design 25 bindings-first-view §2, §7 (hq d0760629, PR 543)
Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ