## Summary
The README described two behaviors that don't match the actual code. This PR corrects both so the docs are accurate.
## Changes
- **CPU mode**: README claimed a *minimax* AI, but `public/game.js` (`cpuMove`) picks a random empty cell. Updated to say *random AI*.
- **SQLite**: README said `sql.js` runs *in-memory*, but `server/db.js` persists to a file (`server/data/games.db`). Updated to say *file-based persistence*.
No code changes — documentation only.
---------
Co-authored-by: robi <robi@alecsa.design>
Reviewed-on: #1
Reviewed-by: robi <robi@alecsa.design>
