fix: resolve all CI ruff linting errors (F401, F821, ARG001, SIM117, SIM105, C408)

- Remove unused imports (F401): os/Path/json/threading in tests; os in estimate_pages;
  Path in install_skill; pytest in test_unified_scraper_orchestration
- Fix F821 undefined 'args' in unified_scraper._scrape_local() by storing
  self._cli_args = args in run() and reading via getattr in _scrape_local()
- Fix ARG001/ARG005 unused lambda/function arguments with _ prefix or # noqa:ARG001
  where parameter names must be preserved for keyword-argument compatibility
- Fix C408 unnecessary dict() calls → dict literals in test_enhance_command
- Fix F841 unused variable 'stub' in test_enhance_command
- Fix SIM117 nested with statements → single with in test_unified_scraper_orchestration
- Fix SIM105 try/except/pass → contextlib.suppress in test_unified_scraper_orchestration
- Rewrite TestScrapeLocal to test fixed behavior (not the NameError bug)

All 2267 tests pass, 11 skipped.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/skill_seekers/cli/unified_scraper.py

@@ -562,7 +562,8 @@ class UnifiedScraper:
             # Note: Signal flow analysis is automatic for Godot projects (C3.10)
 
             # AI enhancement settings (CLI --enhance-level overrides per-source config)
-            cli_enhance_level = getattr(args, "enhance_level", None) if args is not None else None
+            cli_args = getattr(self, "_cli_args", None)
+            cli_enhance_level = getattr(cli_args, "enhance_level", None) if cli_args is not None else None
             enhance_level = cli_enhance_level if cli_enhance_level is not None else source.get("enhance_level", 0)
 
             # Run codebase analysis
@@ -953,6 +954,9 @@ class UnifiedScraper:
                   When provided, enhancement workflows (--enhance-workflow,
                   --enhance-stage) are executed after the skill is built.
         """
+        # Store CLI args so _scrape_local() can access --enhance-level override
+        self._cli_args = args
+
         logger.info("\n" + "🚀 " * 20)
         logger.info(f"Unified Scraper: {self.config['name']}")
         logger.info("🚀 " * 20 + "\n")