Merge pull request 'feat(l1): AI decision-tree builder — Phase 2A' (#193) from feat/l1-ai-tree-builder-phase-2a into main

Phase 2A routes in-category problems (keyword fallback matches 'outlook' →
email_outlook_client) to an AI-build walk, so the old Outlook fixture never
reached the ad-hoc badge. Use a custom-LOB problem and click through the
out-of-scope 'Walk it ad-hoc' fallback.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/e2e/l1-workspace.spec.ts

@@ -71,14 +71,19 @@ test.describe('L1 Workspace', () => {
       page.getByRole('heading', { name: /Good (morning|afternoon|evening)/i }),
     ).toBeVisible()
 
-    // Fill in problem statement textarea
+    // Fill in problem statement textarea. The problem must NOT keyword-match
+    // any DEFAULT_L1_CATEGORIES token (Phase 2A routes in-category problems to
+    // an AI-build walk, not ad-hoc) — a custom LOB app is out of scope.
     const problemTextarea = page.getByPlaceholder("What's the user calling about?")
     await expect(problemTextarea).toBeVisible()
-    await problemTextarea.fill('Customer says Outlook is broken after the latest update')
+    await problemTextarea.fill('Custom LOB billing app crashes on launch for one user')
 
     // Click "Start walk →" button
     await page.getByRole('button', { name: /Start walk/i }).click()
 
+    // Out-of-scope prompt offers the free-form fallback — take it
+    await page.getByRole('button', { name: /Walk it ad-hoc/i }).click()
+
     // Should navigate to /l1/walk/<uuid>
     await expect(page).toHaveURL(/\/l1\/walk\//, { timeout: 10_000 })