Complete M11 Creator Studio and M12 Trust & Safety for PC5

- Creator Studio: Visual behavior & property inspector, GLB model importer, binary persistence
- Trust & Safety: 18+ TOS confirmation (DOB removed), creator guidelines & briefing card on join, in-game reporting HUD
- Test Harness: Add --filter, --skip-backend, --skip-godot to run_checkpoint_tests.py

backend/tests/test_auth_endpoints.py

@@ -149,18 +149,34 @@ class TestRegister:
         assert resp.status_code == 409
         assert "Email already registered" in resp.json()["detail"]
 
-    def test_register_missing_dob(self):
-        """Missing the required date_of_birth field returns 422."""
+    def test_register_without_dob_succeeds(self):
+        """DOB is no longer collected; registration with 18+ TOS agreement succeeds."""
         client = TestClient(app)
         resp = client.post(
             "/api/auth/register",
             json={
-                "username": "user",
-                "email": "user@example.com",
+                "username": "adult_user_nodob",
+                "email": "adult_user_nodob@example.com",
                 "password": "secret123",
+                "over_18": True,
             },
         )
-        assert resp.status_code == 422
+        assert resp.status_code == 201
+
+    def test_register_not_over_18_rejected(self):
+        """Declining 18+ confirmation returns 403."""
+        client = TestClient(app)
+        resp = client.post(
+            "/api/auth/register",
+            json={
+                "username": "underage_declined",
+                "email": "underage_declined@example.com",
+                "password": "secret123",
+                "over_18": False,
+            },
+        )
+        assert resp.status_code == 403
+
 
 
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