Rebuild chess game with tested rules and Swing UI

[ammaster10s]

Summary

• Replace the prototype with a standalone chess rules engine and a refreshed Swing interface.
• Add legal move highlighting, castling, en passant, promotion, game-end detection, clocks, move history, keyboard controls, and restart/draw/resign actions.
• Add build/run scripts, a preview, and 10 headless rule tests.

Verification

• ./test.sh — 10 tests passed.
• javac -Xlint:all -encoding UTF-8 -d /tmp/chessgamejava-final-lint ChessGame.java ChessApp.java ChessGameTest.java — clean.
• Built the runnable JAR and inspected an offscreen UI render after a move.

Known limitation

Draws by repetition and the fifty-move rule are not detected automatically.

main is protected and requires a pull request and verified commit signatures. The pushed commit is unsigned because this machine has no GitHub signing key configured.

[Copilot]

Copilot review overview

🟡 Changes recommended

A critical timeout-result issue and a moderate promotion-history issue remain unresolved.

Review effort: Lite
Findings: 1

Open (1)

• Check for dead position before awarding timeout win · New

What changed in this PR

Rebuilds the prototype into a tested chess rules engine with a refreshed Swing UI.

Changes:

• Adds legal moves, special moves, game-end detection, clocks, history, and controls.
• Adds headless tests and build/run scripts.
• Removes obsolete prototype classes and updates documentation.

Review findings:

• ChessApp.java:445 — Critical: timeout results need a dead-position/mating-material check; 1 vote.
• ChessApp.java:413 — Moderate: knight promotion history should use N, not K; 1 vote.

File	Description
TestGraphics.java	Removes prototype preview
test.sh	Test runner
run.sh	Application launcher
README.md	Usage and project documentation
Piece.java	Removes prototype piece logic
MouseMotion.java	Removes prototype input handling
ImageCreater.java	Removes prototype image loader
ChessGameTest.java	Headless rule tests
ChessGame.java	Standalone chess rules engine
Chessclock.java	Removes prototype clock
Chessboard.java	Removes prototype board
ChessApp.java	Swing interface, clocks, and controls
build.sh	Runnable JAR build script
.vscode/​settings.json	Removes obsolete editor settings
.gitignore	Ignores generated files

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