fix(tests): satisfy basedpyright in test_representation_manager

The save-representation tests added in #615 were structurally correct but
failed strict typing in two places. Static Analysis has been red on main
since the merge.

- `mock_save.await_args` is `_Call | None`; assert it's not None before
  reading `.kwargs` / `.args` so basedpyright can narrow the type
- `SimpleNamespace(...)` passed as `message_level_configuration` is an
  intentional duck-typed mock (only `.dream.enabled` is read by
  `save_representation`), so opt out at the call site with
  `# pyright: ignore[reportArgumentType]` rather than constructing a
  full `ResolvedConfiguration` (matches the existing `reportPrivateUsage`
  ignore pattern in this file)

No runtime behavior changes; `uv run basedpyright` is now clean
project-wide.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/crud/test_representation_manager.py

@@ -24,6 +24,7 @@ async def _fake_tracked_db(_name: str):
 
 def _saved_observations(mock_save: AsyncMock):
     call = mock_save.await_args
+    assert call is not None, "mock was not awaited"
     if "all_observations" in call.kwargs:
         return call.kwargs["all_observations"]
     if len(call.args) > 1:
@@ -162,7 +163,9 @@ class TestRepresentationManagerSoftDelete:
 
 class TestRepresentationManagerSave:
     @pytest.mark.asyncio
-    async def test_save_representation_filters_blank_observations_before_embedding(self):
+    async def test_save_representation_filters_blank_observations_before_embedding(
+        self,
+    ):
         manager = RepresentationManager(
             "workspace",
             observer="observer",
@@ -202,7 +205,7 @@ class TestRepresentationManagerSave:
                 message_ids=[1],
                 session_name="session",
                 message_created_at=datetime.now(timezone.utc),
-                message_level_configuration=SimpleNamespace(
+                message_level_configuration=SimpleNamespace(  # pyright: ignore[reportArgumentType]
                     dream=SimpleNamespace(enabled=False)
                 ),
             )
@@ -258,7 +261,7 @@ class TestRepresentationManagerSave:
                 message_ids=[1],
                 session_name="session",
                 message_created_at=datetime.now(timezone.utc),
-                message_level_configuration=SimpleNamespace(
+                message_level_configuration=SimpleNamespace(  # pyright: ignore[reportArgumentType]
                     dream=SimpleNamespace(enabled=False)
                 ),
             )
@@ -311,7 +314,7 @@ class TestRepresentationManagerSave:
                 message_ids=[1],
                 session_name="session",
                 message_created_at=datetime.now(timezone.utc),
-                message_level_configuration=SimpleNamespace(
+                message_level_configuration=SimpleNamespace(  # pyright: ignore[reportArgumentType]
                     dream=SimpleNamespace(enabled=False)
                 ),
             )