Provides a ready-to-use REPL environment with:
- Pre-configured game state with two players and active Pokemon
- Sample card definitions (Pikachu, Charmander, Bulbasaur, Potion, Energy)
- Helper functions: make_ctx(), reset_game(), show_board()
- All imports ready (effects, models, config, RNG)
Usage: cd backend && uv run python -i references/console_testing.py
