Add Chromium-only Blender WebEngine parity work

tools/web/check-topology-collapse.mjs

@@ -0,0 +1,17 @@
+import { execFileSync } from "node:child_process";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
+const probe = path.join(root, "tools/web/probe-topology-collapse.mjs");
+const output = execFileSync(process.execPath, [probe], { cwd: root, encoding: "utf8" }).trim();
+const results = JSON.parse(output.split("\n").at(-1) ?? "[]");
+const expected = new Set(["mesh:OpenQuad", "mesh:OpenNgon", "mesh:NonManifold"]);
+
+for (const result of results) {
+  if (!expected.delete(result.meshId) || result.result !== 0 || result.triangles <= 0) {
+    throw new Error(`Topology Collapse failed: ${output}`);
+  }
+}
+if (expected.size > 0) throw new Error(`Topology Collapse fixture missing meshes: ${[...expected].join(", ")}`);
+console.log(`topology-collapse-ok ${JSON.stringify(results)}`);