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/dependency_analyzer.py

@@ -324,7 +324,7 @@ class DependencyAnalyzer:
         # Single import: import [alias] "package"
         single_import_pattern = r'import\s+(?:(\w+)\s+)?"([^"]+)"'
         for match in re.finditer(single_import_pattern, content):
-            alias = match.group(1)  # Optional alias
+            match.group(1)  # Optional alias
             package = match.group(2)
             line_num = content[: match.start()].count("\n") + 1