feat(simulator): X-ray frontend (dials, pool, brain/mood maps)

Per docs/superpowers/plans/2026-06-04-experience-simulator.md Task 5.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_simulator_api.py

@@ -88,3 +88,15 @@ def test_catalog_meta_reports_counts(client):
     assert data["by_mode"]["video"] == 4
     assert data["by_mode"]["audio"] == 1
     assert set(data["by_status"]) == {"proposed", "approved"}
+
+
+from simulator.app import create_app as _create_app_for_static
+
+
+def test_index_is_served():
+    # The default app mounts the real static dir.
+    client = TestClient(_create_app_for_static())
+    resp = client.get("/")
+    assert resp.status_code == 200
+    assert "text/html" in resp.headers["content-type"]
+    assert "X-ray" in resp.text