AKUNUR 2.10.1 - ECHO CAPTURE

Base
- Built from Akunur 2.10.0.
- Retains the Radius 7 standard opening and optional Free placement.

Echo capture
- An Echo Piece may still move normally.
- It may jump to its empty Echo Point as before.
- If its Echo Point contains an opposing stone, the Echo Piece may jump there and capture it.
- An Echo capture removes the opposing stone outright; it does not echo or exchange positions with the moving piece.
- A friendly stone at the Echo Point blocks the jump.
- Echo Pieces remain locked when they occupy a corner.

Interface
- Selecting an Echo Piece shows the red dashed Echo line for either an empty jump or an Echo capture.
- An occupied enemy Echo Point also receives the normal capture marker.
- The move log states when an Echo capture removes a stone.

Compatibility
- Echo Piece identity remains stored separately in state.echoPieces.
- Undo and repetition state continue to include Echo Piece identity.
- The heuristic AI receives Echo captures through the normal legal-action and simulation pipeline.

Version
2.10.1
