refactor: consume external road compiler

scripts/build-area.js

@@ -4,7 +4,7 @@ const fs = require("fs");
 const path = require("path");
 const { spawnSync } = require("child_process");
 const { readAreaConfig } = require("./lib/area-config");
-const { compileArea: compileNativeRoads } = require("./compile-native-roads");
+const { compileArea: compileNativeRoads } = require("./lib/road-compiler-cli");
 const { resolveStages } = require("./lib/build-stages");
 const { validateManifest, addIntegrity } = require("./lib/package-contract");
 const { blenderExecutable: resolveBlenderExecutable } = require("./lib/tool-paths");
@@ -226,7 +226,7 @@ function buildBlenderScene(area, roadProvider) {
   fs.mkdirSync(path.dirname(area.outputs.blend), { recursive: true });
   fs.mkdirSync(path.dirname(area.outputs.render), { recursive: true });
   if (roadProvider === "native") {
-    compileNativeRoads(configPath);
+    compileNativeRoads(area);
     ensureNativeRoadLayers(area);
   }