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_c3_integration.py

@@ -136,7 +136,7 @@ class TestC3Integration:
             },
         }
 
-    def test_codebase_analysis_enabled_by_default(self, _mock_config, temp_dir):
+    def test_codebase_analysis_enabled_by_default(self, mock_config, temp_dir):  # noqa: ARG002
         """Test that enable_codebase_analysis defaults to True."""
         # Config with GitHub source but no explicit enable_codebase_analysis
         config_without_flag = {
@@ -155,7 +155,7 @@ class TestC3Integration:
 
         # Verify default is True
         github_source = scraper.config["sources"][0]
-        assert github_source.get("enable_codebase_analysis", True) == True
+        assert github_source.get("enable_codebase_analysis", True)
 
     def test_skip_codebase_analysis_flag(self, mock_config, temp_dir):
         """Test --skip-codebase-analysis CLI flag disables analysis."""