HoldersIn is the one holder function a part gives seatlist.Part.Holders: the modules holding a seat on any node, from the seat-holders view as the part last heard it (a views follower's or a watched state's values), so a callers entry `seat:<seat>` is resolved with no call per checked call. Builds: design 47 G A-295, A-210 Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h