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/generate_router.py

@@ -263,9 +263,9 @@ Examples:
     print(f"{'='*60}")
     print(f"1. Review router SKILL.md: {skill_path}")
     print(f"2. Optionally scrape router (for overview pages):")
-    print(f"     python3 cli/doc_scraper.py --config {config_path}")
+    print(f"     skill-seekers scrape --config {config_path}")
     print("3. Package router skill:")
-    print(f"     python3 cli/package_skill.py output/{generator.router_name}/")
+    print(f"     skill-seekers package output/{generator.router_name}/")
     print("4. Upload router + all sub-skills to Claude")
     print("")