Changed ResetReceivedEvents from partial to regular method in EntitySpawner to ensure proper event queue clearing. Updated Level.cs to clear tempCellsLocal instead of tempCells, addressing potential issues with thread-local storage.
Refactors event, entity, and physics management to use thread-safe and lock-free data structures (Immutable collections, ConcurrentQueue, ConcurrentDictionary, Channel) for improved concurrency and performance. Replaces O(n) queue lookups with O(1) set/dictionary checks, ensures atomic updates for shared state, and optimizes queue draining and deferred action processing. Updates related code to use new APIs and patterns, and adds documentation for thread safety and workflow.
