A requirement neither bound nor pinned points to the provider on the consumer's node, else the only provider; otherwise the entry carries the new field held (seat mesh-wants' AssignmentEntry, generated by seatgen), naming each placed provider as a candidate, and nothing is guessed. The named seat's holder and the contribution edge wait for their design line. Builds: design 47 G §357; lead answer A-167 Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h