Full Game Simulation Benchmark

[smly]

Measure the speed of a complete Hanchan game simulation (full game loop where actionable Actors are prompted with act()).

• Create Rust Criterion benchmark (benches/simulation_bench.rs)
• Measure Hanchan simulation throughput with random agents (games/sec)
• Benchmark both 4-player and 3-player modes
• Output statistics: steps per round, wall consumption rate

Optional:

• Record baselines and enable CI regression detection