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_unified.py

@@ -57,7 +57,7 @@ def test_detect_unified_format():
 
     try:
         validator = ConfigValidator(config_path)
-        assert validator.is_unified == False
+        assert not validator.is_unified
     finally:
         os.unlink(config_path)
 
@@ -115,7 +115,7 @@ def test_needs_api_merge():
     }
 
     validator = ConfigValidator(config_no_merge)
-    assert validator.needs_api_merge() == False
+    assert not validator.needs_api_merge()
 
 
 def test_backward_compatibility():