Branch: Akunur v3.1 prototype
Release: 3.1.0-alpha.1
Purpose: Multi-player core/player-state foundation for three-player Akunur
Parent: 3.0.0-alpha.11
Status: Experimental architecture / compatibility build

Scope:
- authoritative rules state supports 2 or 3 active players;
- third player is N = Natural/Wood;
- core turn order supports White -> Black -> Wood -> White;
- three-player core states use Free placement in alpha.1;
- browser, agents and analysis remain two-player;
- new reserve/replacement behaviour is not yet implemented.
