Integrate ui-design-code via submodule and runtime assets

README.md

@@ -3,3 +3,18 @@
 Architecture documentation was moved to the Project Bible:
 
 - `bible/README.md`
+
+## UI design-code integration
+
+`core` now serves UI theme assets from `ui-design-code` at runtime:
+
+- CSS: `/ui-design/static/css/theme.css`
+- JS: `/ui-design/static/js/app.js`
+
+Path resolution order for `ui-design-code`:
+
+1. `UI_DESIGN_CODE_DIR` env var
+2. `./tools/ui-design-code`
+3. `../ui-design-code`
+
+This lets UI updates in `ui-design-code` appear in `core` without copying files.