ns-ui / tabs-notch-tenon — tabs as joinery
A quiet week — throughput held steady and nothing paged. The joint below marks which tab this content belongs to, at rest, with no motion needed to prove it.
The bottom rule is one path, missing a notch under the active tab; the panel below carries a raised nub that slots into that gap. Switch tabs — arrow keys work too — and the joint travels, tapping home.