Design 47 *Each part acts on its own entries* and *Every part takes a first view, then
follows the events*: the builder reads its placements through the seat mesh-wants'
view, never the assigner's state. The seat's client gets Placed over assignment graph
revisions (ADR 0625 §4: the logic the gate's three callers share), and the gate a
Revision feed; the first revision settles it, a pair new in a later one stands since
that revision's time, as the state's write time did (issue 1940).
Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ
Builds: design 47 G §348, §195, §200
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