fix: Fix remaining 61 ruff linting errors (SIM102, SIM117)

Fixed all remaining linting errors from the 310 total:
- SIM102: Combined nested if statements (31 errors)
  - adaptors/openai.py
  - config_extractor.py
  - codebase_scraper.py
  - doc_scraper.py
  - github_fetcher.py
  - pattern_recognizer.py
  - pdf_scraper.py
  - test_example_extractor.py

- SIM117: Combined multiple with statements (24 errors)
  - tests/test_async_scraping.py (2 errors)
  - tests/test_github_scraper.py (2 errors)
  - tests/test_guide_enhancer.py (20 errors)

- Fixed test fixture parameter (mock_config in test_c3_integration.py)

All 700+ tests passing.

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

tests/test_issue_219_e2e.py

@@ -8,6 +8,7 @@ Tests verify complete fixes for:
 3. Custom API endpoint support (ANTHROPIC_BASE_URL, ANTHROPIC_AUTH_TOKEN)
 """
 
+import contextlib
 import os
 import shutil
 import subprocess
@@ -169,11 +170,8 @@ class TestIssue219Problem2CLIFlags(unittest.TestCase):
             mock_github_main.return_value = 0
 
             # Call main dispatcher
-            with patch("sys.exit"):
-                try:
-                    main.main()
-                except SystemExit:
-                    pass
+            with patch("sys.exit"), contextlib.suppress(SystemExit):
+                main.main()
 
             # VERIFY: github_scraper.main was called
             mock_github_main.assert_called_once()