Add tests for box brush commands, E2E, geometry, and update scene document serialization test

tests/serialization/scene-document-json.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect, it } from "vitest";
 
+import { createBoxBrush } from "../../src/document/brushes";
 import { createEmptySceneDocument } from "../../src/document/scene-document";
 import { migrateSceneDocument } from "../../src/document/migrate-scene-document";
 import { parseSceneDocumentJson, serializeSceneDocument } from "../../src/serialization/scene-document-json";
@@ -12,6 +13,49 @@ describe("scene document JSON", () => {
     expect(parseSceneDocumentJson(serializedDocument)).toEqual(document);
   });
 
+  it("round-trips a document containing a canonical box brush", () => {
+    const brush = createBoxBrush({
+      id: "brush-box-room",
+      center: {
+        x: 0,
+        y: 1,
+        z: 0
+      },
+      size: {
+        x: 4,
+        y: 2,
+        z: 6
+      }
+    });
+    const document = {
+      ...createEmptySceneDocument({ name: "Brush Scene" }),
+      brushes: {
+        [brush.id]: brush
+      }
+    };
+
+    expect(parseSceneDocumentJson(serializeSceneDocument(document))).toEqual(document);
+  });
+
+  it("migrates the foundation schema to the current schema version", () => {
+    const migratedDocument = migrateSceneDocument({
+      version: 1,
+      name: "Foundation Scene",
+      world: createEmptySceneDocument().world,
+      materials: {},
+      textures: {},
+      assets: {},
+      brushes: {},
+      modelInstances: {},
+      entities: {},
+      interactionLinks: {}
+    });
+
+    expect(migratedDocument.version).toBe(2);
+    expect(migratedDocument.brushes).toEqual({});
+    expect(migratedDocument.name).toBe("Foundation Scene");
+  });
+
   it("rejects unsupported versions", () => {
     expect(() =>
       migrateSceneDocument({