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/config_extractor.py

@@ -467,14 +467,10 @@ class ConfigParser:
 
             for node in ast.walk(tree):
                 if isinstance(node, ast.Assign):
-                    # Get variable name
-                    if len(node.targets) == 1 and isinstance(node.targets[0], ast.Name):
+                    # Get variable name and skip private variables
+                    if len(node.targets) == 1 and isinstance(node.targets[0], ast.Name) and not node.targets[0].id.startswith("_"):
                         key = node.targets[0].id
 
-                        # Skip private variables
-                        if key.startswith("_"):
-                            continue
-
                         # Extract value
                         try:
                             value = ast.literal_eval(node.value)