Labelled layouts for both halves, and the overview redrawn from the real shapes rather than a placeholder ergo core. The 36/39 asymmetry means the two halves are separate board designs, not one file mirrored - README and BOM updated to match. 100 of the 104 positions now have a physical key; only Insert, PrtSc, ScrLk and Pause need a layer. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>