The bridge watches the registrations' branches by origin (a first view of registrations, then registration-changed),
before the first registration the gate's source's (source-moved); no branch is named in its code, Trunk goes. Every
move is heard on the seat git's branch-moved through the bridge's durable on SEAT_git_branch-moved, its head read by
the seat's verb branch, never the event's: merged with its pull request and `base` (the watched branch) when the
seat's pull names the head a pull request's merge, else `pushed` with branch, head and `before`, both with the
take-in inputs at the head. The last head written per watched branch is kept in the state heads under
branch.<owner>.<name>.<escaped branch>, so a move heard twice writes once, and each watched branch's head is read at
the start and when a branch is registered. A move of an unprotected branch writes nothing. pull.merged into a watched
branch writes nothing (its message is the move's); the forge-made merge's trunk filter goes.
Builds: design 47 G §4, §7, §11, §20, §41, §507, §509, §532, §714, A-227, A-236
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
jschoubben
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