osmWorkflow/.trellis/tasks/archive/2026-08/08-17-native-road-center-line-styles/implement.md

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

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.