feat(studio): deploy manual designer and configurable AI model

test/studio-ai.test.ts

@@ -56,7 +56,7 @@ test("APIMart uses the specified model, bearer authentication, non-streaming JSO
       );
       expect(init?.signal).toBe(controller.signal);
       const body = JSON.parse(init?.body as string);
-      expect(body.model).toBe("gpt-6-luna");
+      expect(body.model).toBe("gpt-5-mini");
       expect(body.stream).toBe(false);
       expect(body.max_tokens).toBe(AI_OUTPUT_TOKENS);
       expect(body.messages).toEqual([
@@ -87,7 +87,7 @@ test("AI proposals use engine validation, preserve draft source, locks and revis
   const batch = await response!.json();
   expect(batch.alternatives).toHaveLength(3);
   expect(batch.provenance.provider).toBe("APIMart");
-  expect(batch.provenance.model).toBe("gpt-6-luna");
+  expect(batch.provenance.model).toBe("gpt-5-mini");
   expect(JSON.stringify(system)).toBe(original);
   const locked = await handler(
     await request(await input(["/tokens/shape.control"])),
@@ -114,7 +114,7 @@ test("metadata and errors never contain the key or raw upstream response", async
     new Request("https://components.example/design-studio/api/generation"),
   );
   const text = await meta!.text();
-  expect(text).toContain("gpt-6-luna");
+  expect(text).toContain("gpt-5-mini");
   expect(JSON.parse(text).timeoutMs).toBe(AI_TIMEOUT_MS);
   expect(AI_TIMEOUT_MS).toBe(60_000);
   expect(text).not.toContain("test-secret");
@@ -227,7 +227,7 @@ test("authentication and quota failures provide actionable redacted diagnostics
   for (const [status, code, hint] of [
     [401, "invalid_api_key", "server API key"],
     [402, "insufficient_quota", "credit or quota"],
-    [404, "model_not_found", "gpt-6-luna"],
+    [404, "model_not_found", "configured model"],
   ] as const) {
     let calls = 0;
     const handler = studioAI(
@@ -407,3 +407,28 @@ test("background generation cancellation aborts the provider and leaves no propo
   expect((await response!.json()).status).toBe("cancelled");
   expect(aborted).toBe(true);
 });
+
+test("the configured model is used consistently for metadata and upstream requests", async () => {
+  let selected = "";
+  const handler = studioAI(
+    "test-secret",
+    mockFetch(async (_url, init) => {
+      selected = JSON.parse(init!.body as string).model;
+      return completion();
+    }),
+    "custom-model",
+  );
+  const metadata = await (await handler(
+    new Request("https://components.example/design-studio/api/generation"),
+  ))!.json();
+  expect(metadata.model).toBe("custom-model");
+  const batch = await (await handler(await request()))!.json();
+  expect(selected).toBe("custom-model");
+  expect(batch.provenance.model).toBe("custom-model");
+  expect(
+    addStudioGuide('<div id="diagnostics"></div>', true, "custom-model"),
+  ).toContain("custom-model");
+  expect(
+    addStudioGuide('<div id="diagnostics"></div>', true, "<script>"),
+  ).not.toContain("with <script>");
+});