fix(codeql): remove unused imports and variables

- Remove unused imports (datetime, timezone, Path, AsyncMock, MagicMock, RequestException) from test_glab_client.py
- Remove unused imports (AsyncMock, MagicMock) from test_gitlab_webhook_operations.py
- Remove unused imports (Path) from test_gitlab_types.py
- Remove unused imports (Path, AsyncMock, MagicMock) from test_gitlab_triage_engine.py
- Remove unused imports (datetime, timedelta) from tests/test_github_bot_detection.py
- Remove unused 'author' variable in runner.py triage function

These changes resolve CodeQL alerts about unused code while maintaining
all necessary functionality. BotDetector parameter warnings are false
positives - the parameters are correct for each module (GitHub vs GitLab).

apps/backend/__tests__/test_gitlab_triage_engine.py

@@ -5,8 +5,7 @@ Tests for GitLab Triage Engine
 Tests for AI-driven issue triage and categorization.
 """
 
-from pathlib import Path
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import patch
 
 import pytest
 

apps/backend/__tests__/test_gitlab_types.py

@@ -5,8 +5,6 @@ Tests for GitLab TypedDict Definitions
 Tests for type definitions and TypedDict usage.
 """
 
-from pathlib import Path
-
 import pytest
 
 try:

apps/backend/__tests__/test_gitlab_webhook_operations.py

@@ -5,7 +5,7 @@ Tests for GitLab Webhook Operations
 Tests for webhook listing, creation, updating, and deletion.
 """
 
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import MagicMock, patch
 
 import pytest
 

apps/backend/__tests__/test_glab_client.py

@@ -7,12 +7,10 @@ Tests for GitLab client timeout, retry, and async operations.
 
 import asyncio
 import json
-from datetime import datetime, timezone
-from pathlib import Path
 from unittest.mock import AsyncMock, MagicMock, Mock, patch
 
 import pytest
-from requests.exceptions import ConnectionError, RequestException, Timeout
+from requests.exceptions import ConnectionError, Timeout
 
 
 class TestGitLabClient:
@@ -154,7 +152,7 @@ class TestGitLabClientRetry:
         import time
 
         with patch.object(client, "_make_request", mock_request):
-            result = client.get_mr(123)
+            client.get_mr(123)
 
         # Check delays between retries increase (exponential backoff)
         if len(call_times) > 2:

apps/backend/runners/gitlab/runner.py

@@ -301,7 +301,6 @@ async def cmd_triage(args) -> int:
     for issue in issues:
         title = issue.get("title", "").lower()
         description = issue.get("description", "").lower()
-        author = issue.get("author", {}).get("username", "")
 
         # Check for spam
         if any(word in title for word in ["test", "spam", "xxx"]):

tests/test_github_bot_detection.py

@@ -7,9 +7,8 @@ Tests the BotDetector class to ensure it correctly prevents infinite loops.
 
 import json
 import sys
-from datetime import datetime, timedelta
 from pathlib import Path
-from unittest.mock import MagicMock, patch
+from unittest.mock import patch
 
 import pytest