style: apply ruff's automatic fixes and formatter

Mechanical only, and separated from the judgment calls that follow so the
reviewable changes are not buried in a 98-file whitespace diff.

227 automatic fixes: 60 blank lines carrying whitespace, 60 unsorted import
blocks, 34 Optional[X] to X | None, 28 unused imports, 16 deprecated typing
imports, 12 datetime.timezone.utc to datetime.UTC, and assorted smaller
modernisations. Then `ruff format` over src and tests: 98 files reformatted,
35 already conforming.

No file among the unused-import findings defines __all__ or is an __init__.py,
so nothing here removes a re-export.

`make test`: 658 passed, unchanged from HEAD.

Two things observed while verifying, neither addressed here:

`pytest tests/` cannot collect — tests/e2e/test_orchestration_e2e.py uses an
`e2e` marker that is not registered, and the config is strict about markers.
This fails identically at HEAD, so it predates this change; `make test` passes
because it ignores tests/e2e, tests/integration and tests/contracts.

test_tatlock_tool_call_logging_calculator is flaky. It failed once in a full run
with these changes and passed on the next, passes in isolation with them, and
fails in isolation at HEAD. It is order- or timing-dependent, not a regression
from this commit — established by running the full suite both ways rather than
by reasoning about which change could have caused it.

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

tests/core/test_household_registry.py

@@ -3,6 +3,7 @@ Tests for household registry.
 
 Tests capability registration, toolset scoping, and coordination features.
 """
+
 import pytest
 from pydantic_ai.tools import Tool
 
@@ -10,7 +11,6 @@ from src.core.household_registry import (
     HouseholdCapability,
     HouseholdMember,
     HouseholdRegistry,
-    household_registry,
 )
 
 
@@ -38,6 +38,7 @@ def sample_capability():
 @pytest.fixture
 def sample_tools():
     """Sample tool definitions."""
+
     def test_function_1(x: int) -> int:
         """Test function 1."""
         return x * 2
@@ -96,6 +97,7 @@ class TestHouseholdMember:
     def test_member_with_agent(self, sample_capability, sample_tools):
         """Test member can include an agent."""
         from unittest.mock import Mock
+
         mock_agent = Mock()
 
         member = HouseholdMember(
@@ -322,7 +324,9 @@ class TestGetDelegationTools:
         assert callable(tools[0])
         assert tools[0].__name__ == "delegate_to_librarian"
 
-    def test_delegation_tools_returns_raw_tools_for_member_without_agent(self, registry, sample_capability, sample_tools):
+    def test_delegation_tools_returns_raw_tools_for_member_without_agent(
+        self, registry, sample_capability, sample_tools
+    ):
         """Test delegation tools returns raw tools when member has no agent."""
         registry.register("test_tools", sample_capability, sample_tools)
 
@@ -373,8 +377,8 @@ class TestGetDelegationTools:
         assert tools[0].__name__ == "delegate_to_librarian"
 
         # Rest should be raw tools
-        assert hasattr(tools[1], 'name')
-        assert hasattr(tools[2], 'name')
+        assert hasattr(tools[1], "name")
+        assert hasattr(tools[2], "name")
 
     def test_delegation_tools_nonexistent_member(self, registry):
         """Test delegation tools handles non-existent member gracefully."""

tests/core/test_logging_config.py

@@ -3,12 +3,11 @@ Tests for structured logging configuration.
 
 Tests logging setup, context management, and FastAPI integration.
 """
+
 import logging
-from io import StringIO
 from unittest.mock import patch
 
 import pytest
-import structlog
 
 from src.core.logging_config import (
     add_log_level,
@@ -50,10 +49,10 @@ class TestGetLogger:
         """Test get_logger returns structlog BoundLogger."""
         logger = get_logger("test")
         # Logger should have standard logging methods
-        assert hasattr(logger, 'info')
-        assert hasattr(logger, 'debug')
-        assert hasattr(logger, 'warning')
-        assert hasattr(logger, 'error')
+        assert hasattr(logger, "info")
+        assert hasattr(logger, "debug")
+        assert hasattr(logger, "warning")
+        assert hasattr(logger, "error")
 
     def test_get_logger_with_module_name(self):
         """Test logger with module name."""

tests/core/test_memory_service.py

@@ -2,13 +2,14 @@
 Tests for the memory service (direct access layer).
 """
 
+from unittest.mock import AsyncMock, patch
+
 import pytest
-from unittest.mock import MagicMock, patch, AsyncMock
 
 from src.core.memory_service import (
+    MemoryRecord,
     MemoryService,
     MemoryType,
-    MemoryRecord,
     memory_service,
 )
 

tests/core/test_router.py

@@ -1,6 +1,7 @@
 """
 Tests for core router (health check and root endpoints).
 """
+
 import pytest
 from fastapi.testclient import TestClient
 
@@ -11,7 +12,7 @@ from src.core.config import config
 def test_health_check(client: TestClient) -> None:
     """Test health check endpoint returns healthy status."""
     response = client.get("/health")
-    
+
     assert response.status_code == 200
     data = response.json()
     assert data["status"] == "healthy"
@@ -22,7 +23,7 @@ def test_health_check(client: TestClient) -> None:
 def test_root_endpoint(client: TestClient) -> None:
     """Test root endpoint returns API information."""
     response = client.get("/")
-    
+
     assert response.status_code == 200
     data = response.json()
     assert data["name"] == config.APP_NAME
@@ -42,7 +43,7 @@ def test_openapi_schema(client: TestClient) -> None:
     """Test that OpenAPI schema is accessible."""
     response = client.get("/openapi.json")
     assert response.status_code == 200
-    
+
     schema = response.json()
     assert schema["info"]["title"] == config.APP_NAME
     assert schema["info"]["version"] == config.APP_VERSION

tests/core/test_tenant_guard.py

@@ -157,9 +157,7 @@ class TestRequestContextGuard:
             "jpmschweitzer!",
         ],
     )
-    @pytest.mark.parametrize(
-        "environment", [Environment.DEVELOPMENT, Environment.TESTING]
-    )
+    @pytest.mark.parametrize("environment", [Environment.DEVELOPMENT, Environment.TESTING])
     def test_production_tenant_sanitization_variants_are_forced(
         self, monkeypatch, environment, variant
     ):
@@ -175,9 +173,8 @@ class TestRequestContextGuard:
         with RequestContext(user=variant):
             effective = get_user()
             assert effective == TEST_TENANT
-            assert (
-                get_memory_collection_name(effective)
-                != get_memory_collection_name(PRODUCTION_TENANT)
+            assert get_memory_collection_name(effective) != get_memory_collection_name(
+                PRODUCTION_TENANT
             )
 
     def test_dev_non_colliding_user_is_not_forced(self, monkeypatch):
@@ -228,10 +225,7 @@ class TestSuiteRunsUnderTestTenant:
         from src.core.context import get_default_user
         from src.core.multi_tenancy import get_memory_collection_name
 
-        assert (
-            get_memory_collection_name(get_default_user())
-            == f"memories_{TEST_TENANT}"
-        )
+        assert get_memory_collection_name(get_default_user()) == f"memories_{TEST_TENANT}"
 
     def test_redis_session_namespace_is_test_tenant(self):
         from src.core.context import get_default_user

tests/core/test_tool_tracking.py

@@ -3,6 +3,7 @@ Tests for tool call tracking.
 
 Tests capability extraction and recommendation matching.
 """
+
 import pytest
 
 from src.core.tool_tracking import ToolCallTracker
@@ -29,9 +30,7 @@ class TestToolCallTracker:
     @pytest.mark.asyncio
     async def test_track_call_recognizes_delegation_as_recommended(self):
         """Test that delegate_to_X is recognized when X is recommended."""
-        tracker = ToolCallTracker(
-            recommended_capabilities=["librarian", "biographer"]
-        )
+        tracker = ToolCallTracker(recommended_capabilities=["librarian", "biographer"])
 
         await tracker.track_call("delegate_to_librarian", 1.0)
 
@@ -42,9 +41,7 @@ class TestToolCallTracker:
     @pytest.mark.asyncio
     async def test_track_call_detects_not_recommended(self):
         """Test that unrecommended tools are flagged."""
-        tracker = ToolCallTracker(
-            recommended_capabilities=["librarian"]
-        )
+        tracker = ToolCallTracker(recommended_capabilities=["librarian"])
 
         await tracker.track_call("delegate_to_housekeeper", 1.0)
 
@@ -55,9 +52,7 @@ class TestToolCallTracker:
 
     def test_get_summary_with_delegation_tools(self):
         """Test summary correctly maps delegation tools to capabilities."""
-        tracker = ToolCallTracker(
-            recommended_capabilities=["librarian", "biographer"]
-        )
+        tracker = ToolCallTracker(recommended_capabilities=["librarian", "biographer"])
         tracker.actual_calls = {
             "delegate_to_librarian": [1.0, 2.0],
             "delegate_to_housekeeper": [0.5],  # Not recommended
@@ -72,9 +67,7 @@ class TestToolCallTracker:
     @pytest.mark.asyncio
     async def test_finalize_with_delegation_tools(self):
         """Test finalize correctly identifies unused recommendations."""
-        tracker = ToolCallTracker(
-            recommended_capabilities=["librarian", "biographer"]
-        )
+        tracker = ToolCallTracker(recommended_capabilities=["librarian", "biographer"])
         tracker.actual_calls = {
             "delegate_to_librarian": [1.0],
         }