Story 26: Establish TDD workflow and quality gates

Add workflow engine with acceptance gates, test recording, and review
queue. Frontend displays gate status (blocked/ready), test summaries,
failing badges, and warnings. Proceed action is disabled when gates
are not met. Includes 13 unit tests (Vitest) and 9 E2E tests
(Playwright) covering all five acceptance criteria.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/tests/e2e/review-panel.spec.ts

@@ -0,0 +1,13 @@
+import { expect, test } from "@playwright/test";
+
+test.describe("App boot smoke test", () => {
+  test("renders the project selection screen", async ({ page }) => {
+    await page.goto("/");
+
+    await expect(page.getByText("StorkIt")).toBeVisible();
+    await expect(page.getByPlaceholder("/path/to/project")).toBeVisible();
+    await expect(
+      page.getByRole("button", { name: "Open Project" }),
+    ).toBeVisible();
+  });
+});