test: mocked-session rule tests stub the always-on exclusions lookup; tool count 24 (#2880)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_services_rulebooks.py

@@ -8,6 +8,15 @@ import pytest
 from tests.helpers import fake_rule, fake_rulebook, fake_topic, make_mock_session
 
 
+@pytest.fixture(autouse=True)
+def _no_exclusions():
+    """get_applicable_rules asks for the project's always-on exclusions
+    (milestone 297) through its own session; these mocked-session tests
+    script the rule queries only, so the exclusions lookup is stubbed empty."""
+    with patch("scribe.services.rulebooks.excluded_always_on_rulebooks", AsyncMock(return_value=[])):
+        yield
+
+
 @pytest.mark.asyncio
 async def test_create_rulebook_stores_to_db():
     mock_session = make_mock_session()