Fix CLI path references in Python code

All Python scripts now use correct cli/ prefix in:
- Usage docstrings (shown in --help)
- Print statements (shown to users)
- Subprocess calls (when calling other scripts)

Changes:
- cli/doc_scraper.py: Fixed 9 references (usage, print, subprocess)
- cli/enhance_skill_local.py: Fixed 6 references (usage, print)
- cli/enhance_skill.py: Fixed 5 references (usage, print)
- cli/package_skill.py: Fixed 4 references (usage, epilog)
- cli/estimate_pages.py: Fixed 3 references (epilog examples)

All commands now correctly show:
- python3 cli/doc_scraper.py (not python3 doc_scraper.py)
- python3 cli/enhance_skill.py (not python3 enhance_skill.py)
- python3 cli/enhance_skill_local.py (not python3 enhance_skill_local.py)
- python3 cli/package_skill.py (not python3 package_skill.py)
- python3 cli/estimate_pages.py (not python3 estimate_pages.py)

Also fixed:
- Old hardcoded path in enhance_skill_local.py:221
  (was: /mnt/skills/examples/skill-creator/scripts/package_skill.py)
  (now: cli/package_skill.py)
- Old hardcoded path in enhance_skill.py:210
  (was: /mnt/skills/examples/skill-creator/scripts/package_skill.py)
  (now: cli/package_skill.py)

This ensures all user-facing messages and subprocess calls use the
correct paths when run from the repository root.

Related: PR #145

cli/package_skill.py

@@ -4,9 +4,9 @@ Simple Skill Packager
 Packages a skill directory into a .zip file for Claude.
 
 Usage:
-    python3 package_skill.py output/steam-inventory/
-    python3 package_skill.py output/react/
-    python3 package_skill.py output/react/ --no-open  # Don't open folder
+    python3 cli/package_skill.py output/steam-inventory/
+    python3 cli/package_skill.py output/react/
+    python3 cli/package_skill.py output/react/ --no-open  # Don't open folder
 """
 
 import os
@@ -96,10 +96,10 @@ def main():
         epilog="""
 Examples:
   # Package skill and open folder
-  python3 package_skill.py output/react/
+  python3 cli/package_skill.py output/react/
 
   # Package skill without opening folder
-  python3 package_skill.py output/react/ --no-open
+  python3 cli/package_skill.py output/react/ --no-open
 
   # Get help
   python3 package_skill.py --help