v0.1.3 - Updated Demo GIF

This release refreshes the GitHub README demo GIF so it matches the current Codex Cleaner skill workflow.

Highlights

Regenerate assets/demo.gif for the latest interaction flow.
Show the recommended skill-first experience:
- scan archived conversations
- choose conversations by readable numbered rows
- choose one cleanup mode from the four-option menu
- preview affected local paths before cleanup
- confirm before applying changes
Include the current cleanup choices in the animation:
- conversation-only cleanup
- project-files-only cleanup
- cleanup of both conversation and project files
- permanent deletion as a separate dangerous option
Add Chinese text to the animation so bilingual users can understand the flow.
Update the demo generation script so future GIF updates can be reproduced.

Validated on Windows with:

python .\scripts\make_demo_gif.py
python -m unittest discover -s tests
python -m compileall scripts skills tests