feat(world): Parkwege, Felder, Plätze, Pool und Parkplatz als eigene Schichten

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/geometry.test.js

@@ -101,6 +101,27 @@ describe("geometry", () => {
         expect(out.urban).toBeNull();
     });
 
+    it("baut Parkwege flach auf Straßenhöhe und die neuen Flächenarten wie Beläge", () => {
+        const chunk = {
+            chunk: [0, 0], origin: [0, 0], land: [], roads: [], centerlines: [], palms: [], buildings: [],
+            surfaces: ["field", "court", "pool", "parking"].map((kind) => ({ poly: PLOT, kind })),
+            paths: [{ poly: COURTYARD }],
+        };
+        const out = buildChunkGeometry(chunk);
+        for (const kind of ["field", "court", "pool", "parking"]) {
+            const box = new Box3().setFromBufferAttribute(out[kind].getAttribute("position"));
+            expect(box.max.y, kind).toBeCloseTo(0.02);
+        }
+        const paths = new Box3().setFromBufferAttribute(out.paths.getAttribute("position"));
+        expect(paths.min.y).toBeCloseTo(0.03);
+        expect(footprintArea(out.paths)).toBeCloseTo(800, 6);   // Weg um einen Hof: das Loch bleibt offen
+    });
+
+    it("liefert ohne Parkwege null statt einer leeren Geometrie", () => {
+        const chunk = { chunk: [0, 0], origin: [0, 0], land: [PLOT], surfaces: [], roads: [], centerlines: [], buildings: [], palms: [] };
+        expect(buildChunkGeometry(chunk).paths).toBeNull();
+    });
+
     it("gibt Gebäuden eine Farbe je Haus", () => {
         const chunk = { chunk: [0, 0], origin: [0, 0], land: [], surfaces: [], roads: [], centerlines: [], palms: [],
             buildings: [{ poly: PLOT, height: 9, source: "district", speculative: false }] };