# Implementation Plan

1. Add validated `center-line-style` overrides and a helper which resolves the
   effective default/override style by segment ID.
2. Generate yellow/white and dashed/solid centre-line geometry while retaining
   cutback and control-marking exclusion behaviour; publish effective style
   properties.
3. Extend the native Blender layer adapter/material handling to distinguish
   white from yellow centre-line features without affecting legacy layers.
4. Add Workbench style controls, staging, Chinese selection evidence, and
   immediate regenerated-layer display.
5. Add focused compiler, override, Workbench, Blender catalog, and build-stage
   tests; compile/check Nantaizi and build Blender/Cesium/preview without the
   package stage.

## Validation

```bash
npm run test:native-road
npm run test:road-workbench
python3 -m unittest discover blender/tests
npm run test:build-stages
npm run road:compile -- --config config/areas/nantaizi-lake-innovation-valley.json
npm run road:check -- --config config/areas/nantaizi-lake-innovation-valley.json
npm run build:area -- --config config/areas/nantaizi-lake-innovation-valley.json --stages blender,cesium,preview --road-provider native
```

## Rollback

Remove the override records or choose `--road-provider osm2streets`; no legacy
output is modified.