Added a basic MemoryArena.

Added one scratch, one engine and one game arena.
Converted the game alloc to arena + the display stuff.
WIP

Made using Antigravity+gemini

.agent/workflows/recompile_shaders.md

@@ -1,9 +1,9 @@
 ---
 description: Recompile shaders for the Juliet project
 ---
+// turbo-all
 
 This workflow recompiles all shaders using the `recompile_shaders.bat` script.
 
 1. Recompile all shaders:
-// turbo
 `cmd /c "misc\shell.bat & misc\recompile_shaders.bat"`