Feature — Web-based interface (play vs engine)

[Codex-Crusader]

Summary

Build a simple web app (Flask/FastAPI + small JS frontend) where users can play against the engine via browser.

Motivation

A web interface removes local setup friction and makes demos shareable.

Acceptance criteria / Definition of Done

• Minimal web app that:
  • Shows a board (e.g., using chessboard.js or similar).
  • Lets the user make moves and fetches engine reply from a backend endpoint.
  • Can run locally with a single command (documentation included).
• Security: keep it local by default and document safe deployment considerations.

Implementation notes

• Use FastAPI for ease of async endpoints or Flask for minimal dependencies.
• Serve a static HTML/JS board and call backend endpoints for moves.
• Keep the engine process separate (HTTP call to running engine or spawn a subprocess).

Complexity

Medium–High - front-end + back-end integration work.