Doc sync. CLAUDE.md, REPL.md, and the plate docs had drifted well behind the code — brought all three back in line with what's actually built: materials system (per-face materialIdx, 16-slot palette, Oklab toon bands, per-material smooth angle + outlines), Object mode on TAB with the panel moved to backtick, Spherize (Shift+S), dissolve verts (V), fill (F), inset region (I during inset), copy/paste (Cmd+C/V), edge slide (G→G), along-normals mode, save-as/new/dirty-quit flow with native Cocoa dialogs, .vmk format v3, mm-scale workspace, new camera controls (MMB/scroll pan, Shift+scroll orbit, Cmd+scroll zoom), and the deque-based undo with material snapshots.