fix(hwlab-node): stabilize tray diagnostics updater

internal/cloud/hwpod-node-ops.test.ts

@@ -21,6 +21,7 @@ test("cloud-api exposes hwpod-node-ops contract on /v1", async () => {
     assert.ok(payload.hwpod.supportedOps.includes("workspace.ls"));
     assert.ok(payload.hwpod.supportedOps.includes("workspace.insert-after"));
     assert.equal(payload.hwlabNode.updateRoute, "/v1/hwlab-node/update");
+    assert.equal(payload.hwlabNode.downloadRoute, "/v1/hwlab-node/download/hwlab-node.py");
     assert.equal(payload.hwlabNode.updateContractVersion, "hwlab-node-update-v1");
   } finally {
     await close(server);
@@ -59,6 +60,28 @@ test("cloud-api exposes hwlab-node Python update metadata", async () => {
   }
 });
 
+test("cloud-api serves bundled hwlab-node Python updater artifact by default", async () => {
+  const server = createCloudApiServer({ env: { PATH: process.env.PATH, HWLAB_PUBLIC_ENDPOINT: "https://hwlab.pikapython.com" } });
+  await listen(server);
+  try {
+    const response = await fetch(`${serverUrl(server)}/v1/hwlab-node/update?current=0.1.0&channel=stable&platform=windows`);
+    const payload = await response.json();
+    assert.equal(response.status, 200);
+    assert.equal(payload.updateAvailable, true);
+    assert.equal(payload.latestVersion, "0.1.1");
+    assert.equal(payload.downloadUrl, "https://hwlab.pikapython.com/v1/hwlab-node/download/hwlab-node.py");
+    assert.match(payload.sha256, /^[a-f0-9]{64}$/u);
+
+    const download = await fetch(`${serverUrl(server)}/v1/hwlab-node/download/hwlab-node.py`);
+    const text = await download.text();
+    assert.equal(download.status, 200);
+    assert.equal(download.headers.get("x-hwlab-node-version"), "0.1.1");
+    assert.ok(text.includes('APP_VERSION = "0.1.1"'));
+  } finally {
+    await close(server);
+  }
+});
+
 test("cloud-api discovers preinstalled workspace hwpod-specs without hardcoded device constants", async () => {
   const root = await mkdtemp(path.join(os.tmpdir(), "hwlab-hwpod-spec-discovery-"));
   const specDir = path.join(root, ".hwlab");