refactor(assets): move sprite renderer to standalone project at renderer/

Separates the 3D-to-2D render pipeline from the game client into its
own minimal Godot project. No autoloads, no plugins, no game code —
just the render scene, models, textures, and export script. Eliminates
SimBridge parse errors and gdUnit4 scanning during renders.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -8,7 +8,12 @@ client/export/
 client/reports/
 client/**/*.import
 client/**/*.uid
-client/tooling/sprite_renderer/output/*.png
+
+# Renderer (separate Godot project for sprite pipeline)
+renderer/.godot/
+renderer/**/*.import
+renderer/**/*.uid
+renderer/output/*.png
 
 # Database (shared across worktrees at ../settledreach.db, not tracked)
 db/commonwealth.db*