Develop GUI for Gameplay

[Codex-Crusader]

Summary

Create a simple graphical UI so users can play against the AZ-Lite engine without using the command line.

Motivation

A GUI lowers the barrier for non-technical users and makes demos/screenshots/GIFs easier to produce. It also helps testers and contributors validate moves visually.

Acceptance criteria / Definition of Done

• A minimal GUI (single-file or small module, e.g., gui.py) that displays a chessboard and lets the user:
  • Make moves via mouse clicks.
  • See the engine play its reply move.
  • Reset the board and choose who starts (white/black).
• The GUI uses a lightweight dependency (suggested: tkinter to avoid extra installs; PySimpleGUI/pygame are acceptable).
• README.md updated with instructions to run the GUI (python gui.py) and any dependency note.
• A short demo GIF (10–15s) showing a human vs engine game added under docs/ or assets/.

Implementation notes / suggestions

• Keep it minimal: board rendering, move handling, and call into the existing run_play/engine API to get the engine move.
• Provide a “headless” mode for CI/tests if needed.
• Add a small test that the GUI can start and close (smoke test).

Complexity

Medium (but approachable as a first contribution). Provide helpful pointers for new contributors.