Implements Phase 4 dynamic proxy spawning and actor state synchronization. Adds a dynamic proxy pool (g_dynamicProxyPool), SpawnDynamicProxyActor and GetOrSpawnDynamicProxy to spawn/reuse actors via Player::PlaceAtMe, and updates slot resolution to prefer dynamic proxies with a pre-placed pool fallback. Verifies/integrates existing character-controller velocity injection and clamps speed, and applies remote actor state flags to proxies before animation sync. Enhanced logging for spawn, velocity and state transitions. Changes in plugin/src/F4TProxyActorController.cpp and updated dev log (docs/dev-log.md).