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/split_config.py

@@ -310,9 +310,9 @@ Split Strategies:
         print("1. Review generated configs")
         print("2. Scrape each config:")
         for filepath in saved_files:
-            print(f"     python3 cli/doc_scraper.py --config {filepath}")
+            print(f"     skill-seekers scrape --config {filepath}")
         print("3. Package skills:")
-        print("     python3 cli/package_multi.py configs/<name>-*.json")
+        print("     skill-seekers-package-multi configs/<name>-*.json")
         print("")