refactor: Update CLI commands to use new unified entry points

Updated all command examples in CLI scripts from old pattern:
  python3 cli/<script>.py → skill-seekers <command>

Changes:
- doc_scraper.py → skill-seekers scrape
- github_scraper.py → skill-seekers github
- pdf_scraper.py → skill-seekers pdf
- unified_scraper.py → skill-seekers unified
- enhance_skill.py → skill-seekers enhance
- enhance_skill_local.py → skill-seekers enhance
- package_skill.py → skill-seekers package
- estimate_pages.py → skill-seekers estimate

This reflects the new modern Python packaging with proper entry
points. Users can now use clean commands instead of file paths.

Files updated: 10 CLI scripts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/skill_seekers/cli/estimate_pages.py

@@ -240,13 +240,13 @@ def main():
         epilog="""
 Examples:
   # Estimate pages for a config
-  python3 cli/estimate_pages.py configs/react.json
+  skill-seekers estimate configs/react.json
 
   # Estimate with higher discovery limit
-  python3 cli/estimate_pages.py configs/godot.json --max-discovery 2000
+  skill-seekers estimate configs/godot.json --max-discovery 2000
 
   # Quick estimate (stop at 100 pages)
-  python3 cli/estimate_pages.py configs/vue.json --max-discovery 100
+  skill-seekers estimate configs/vue.json --max-discovery 100
         """
     )