Level Event System

This system consumes LevelEvent messages from the server and applies runtime changes on the client.

Responsibilities

• Update background scroll speed when set_scroll events arrive.
• Swap backgrounds on set_background events.
• Play or switch music on set_music events.
• Record camera bounds and gate states for future systems.

Behavior

• set_scroll updates an internal scroll clock and recomputes the background speed every frame.
• set_background swaps textures on existing background entities or creates one if missing.
• set_music loads the music asset from the manifest and plays it in a loop.
• set_camera_bounds stores bounds; no camera system consumes it yet.
• gate_open / gate_close are stored by id for future gate handling.

Integration

The system runs after NetworkMessageSystem and LevelInitSystem, and before BackgroundScrollSystem.

Migration / Tests / TODO

• Migration: send initial set_scroll after LevelInit; optional set_music if music should start immediately.
• Tests: parser validity for each event type, CRC rejection, background swap without entities.
• TODO: camera bounds consumption in a camera system, gate entity visuals/logic.