WT.4 Wall tool, Cut: split, split with gap, delete segment

Wall tool spec pages 4-8 (Duncan, 2026-11-05), tracked at /roadmap-internal 'BimCraft wall tool specification'. Icons: the DU.1 family (assets/js/app-workspace-icons.js: 32 grid, 1.5 round stroke, two-tone fills, Full Color or Outline). Page 6-7. Not built (BimCraft's own help lists Split as not built): Split at a point or crossing wall (the two parts stay joined end to end, same type; decision D2 is whether they stay joined in line or become free ends), Split with gap (a set gap; rejoin restores one wall), Delete segment (remove the piece between two clicks). Spec test 6. Cut block today is model-trim.js (trim, extend, corner: Built). Icons: wallsplit, wallsplitgap, walldelseg. OTHER APPS: CadCraft plan walls have no Split either (FX.59 assessment); shared recipe. Not started.

walls-09 2026-11-06: Built in /lab: Edit › Walls › Split (at the click or a crossing wall; Gap; Free ends), Delete segment, Rejoin (one wall again, the first keeps its id). Doors and windows go with their part, a cut through one is refused, reference dimensions follow their point. D2 default: the parts stay joined in line (Settings › BimCraft › Walls › When a wall is split: joined | free ends). Spec test 6 Pass (node and real page). Recipes in lib/walls (host-free; copied to bimcraft/a Discord member/walls by tools/walls/sync.mjs), BimCraft adapter wall-tools.js + wall-tools-ui.js. Tests: node lib/walls/test/test.mjs (59/0, known answers worked out in the file), node bin/test-bimcraft.mjs --walltools (all ok, incl. the spec's nine tests: all Pass), real page tools/bimcraft-test/browser-walltools.mjs 33/0. Help: wall-tools (en). NOT done: CadCraft, SuperCad adapter, hand check (WT.4-HAND).

walls-plan-09 2026-11-06 (done): see docs/0.9-sessions/walls-plan-09.md.