fix: resolve linting and formatting issues for CI

- Use contextlib.suppress instead of try/except/pass (SIM105)
- Prefix unused fixture arguments with underscore (ARG002)
- Replace asyncio.TimeoutError with TimeoutError (UP041)
- Apply ruff formatting to all files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/ingestor/test_clob_client.py

@@ -115,25 +115,23 @@ class TestClobClient:
     @pytest.fixture
     def mock_base_client(self) -> MagicMock:
         """Create a mock base CLOB client."""
-        with patch(
-            "polymarket_insider_tracker.ingestor.clob_client.BaseClobClient"
-        ) as mock:
+        with patch("polymarket_insider_tracker.ingestor.clob_client.BaseClobClient") as mock:
             yield mock.return_value
 
-    def test_init_defaults(self, mock_base_client: MagicMock) -> None:
+    def test_init_defaults(self, _mock_base_client: MagicMock) -> None:
         """Test client initialization with defaults."""
         client = ClobClient()
 
         assert client._host == "https://clob.polymarket.com"
         assert client._max_retries == 3
 
-    def test_init_with_env_api_key(self, mock_base_client: MagicMock) -> None:
+    def test_init_with_env_api_key(self, _mock_base_client: MagicMock) -> None:
         """Test client reads API key from environment."""
         with patch.dict("os.environ", {"POLYMARKET_API_KEY": "test-key"}):
             client = ClobClient()
             assert client._api_key == "test-key"
 
-    def test_init_with_explicit_api_key(self, mock_base_client: MagicMock) -> None:
+    def test_init_with_explicit_api_key(self, _mock_base_client: MagicMock) -> None:
         """Test client uses explicitly provided API key."""
         client = ClobClient(api_key="explicit-key")
         assert client._api_key == "explicit-key"