Add all-tools render smoke (E2E)

e2e/tools-smoke.spec.ts

@@ -0,0 +1,26 @@
+import { test, expect } from '@playwright/test';
+import { tools } from '../src/registry/tools';
+
+/**
+ * Render smoke over EVERY registered tool: each page must return 200, mount its
+ * island (a visible <h1>), and not throw an uncaught exception. This one spec
+ * auto-covers all existing tools and every future tool the moment it's added to
+ * the registry — the cheap safety net beneath the per-tool happy-path specs.
+ *
+ * `pageerror` (uncaught JS) is collected but reported as an annotation rather
+ * than a hard failure, because a few tools legitimately throw on load in a
+ * headless browser (no WebGPU / camera / mic). The hard signal is: page loads
+ * and the island hydrates.
+ */
+const pages = tools.filter(t => !t.desktopOnly).map(t => ({ id: t.id, route: t.route }));
+
+for (const { id, route } of pages) {
+  test(`tool page renders: ${id}`, async ({ page }, testInfo) => {
+    const errors: string[] = [];
+    page.on('pageerror', e => errors.push(e.message));
+    const resp = await page.goto(route);
+    expect(resp?.ok(), `${route} returned HTTP ${resp?.status()}`).toBeTruthy();
+    await expect(page.locator('h1').first()).toBeVisible();
+    if (errors.length) testInfo.annotations.push({ type: 'pageerror', description: `${route}: ${errors.join(' | ')}` });
+  });
+}