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/build.md

@@ -1,17 +1,15 @@
 ---
 description: Build the Juliet project using FastBuild
 ---
+// turbo-all
 
 This workflow sets up the Juliet build environment and runs `fbuild`.
 
 1. To build a specific configuration (e.g., msvc-Debug):
-// turbo
 `cmd /c "misc\shell.bat & fbuild msvc-Debug"`
 
 2. To build the default (msvc):
-// turbo
 `cmd /c "misc\shell.bat & fbuild msvc"`
 
 3. To see all available targets:
-// turbo
-`cmd /c "misc\shell.bat & fbuild -targets"`
+`cmd /c "misc\shell.bat & fbuild -showtargets"`