t_p4_anticheat: add basic server-side anti-cheat controller
- Rate limiting: flags players exceeding 130Hz input RPC rate
- Speed hacks: validates position deltas against max speed * 1.5
- Aimbot snap: flags look-direction changes >45° in one tick
- Suspicion level tracking (0.0-1.0) with decay over time
- Escalating thresholds: 0.3=warn(log), 0.6=kick(signal), 0.8=ban(signal, 1h temp)
- Configurable max speed via set_max_speed()
- Ban handler Callable for caller-defined disconnect logic
- Design: generous tolerances, near-zero false positives, Phase-4 basic hardening
shawn
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