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/estimate_pages.py

@@ -155,10 +155,7 @@ def is_valid_url(url, base_url, include_patterns, exclude_patterns):
 
     # Check include patterns (if specified)
     if include_patterns:
-        for pattern in include_patterns:
-            if pattern in url:
-                return True
-        return False
+        return any(pattern in url for pattern in include_patterns)
 
     # If no include patterns, accept by default
     return True
@@ -289,10 +286,7 @@ def list_all_configs():
         rel_path = config_file.relative_to(config_dir)
 
         # Category is the first directory in the path, or "root" if in root
-        if len(rel_path.parts) > 1:
-            category = rel_path.parts[0]
-        else:
-            category = "root"
+        category = rel_path.parts[0] if len(rel_path.parts) > 1 else "root"
 
         if category not in by_category:
             by_category[category] = []