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>

src/skill_seekers/cli/unified_skill_builder.py

@@ -87,10 +87,7 @@ class UnifiedSkillBuilder:
         skill_mds = {}
 
         # Determine base directory for source SKILL.md files
-        if self.cache_dir:
-            sources_dir = Path(self.cache_dir) / "sources"
-        else:
-            sources_dir = Path("output")
+        sources_dir = Path(self.cache_dir) / "sources" if self.cache_dir else Path("output")
 
         # Load documentation SKILL.md
         docs_skill_path = sources_dir / f"{self.name}_docs" / "SKILL.md"