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>

.claude/skills/render-sprite/scripts/render.sh

@@ -7,16 +7,16 @@ set -euo pipefail
 MODEL_NAME="${1:?Usage: render.sh <model_name> [godot_path]}"
 GODOT="${2:-$HOME/bin/godot}"
 REPO_ROOT="$(cd "$(dirname "$0")" && git rev-parse --show-toplevel)"
-PROJECT="$REPO_ROOT/client"
-SCENE="res://tooling/sprite_renderer/render_scene.tscn"
-OUTPUT="$PROJECT/tooling/sprite_renderer/output"
+PROJECT="$REPO_ROOT/renderer"
+SCENE="res://render_scene.tscn"
+OUTPUT="$PROJECT/output"
 
 # Verify model exists
-MODEL_FILE="$PROJECT/tooling/sprite_renderer/models/${MODEL_NAME}.tscn"
+MODEL_FILE="$PROJECT/models/${MODEL_NAME}.tscn"
 if [ ! -f "$MODEL_FILE" ]; then
     echo "ERROR: Model not found: $MODEL_FILE"
     echo "Available models:"
-    ls "$PROJECT/tooling/sprite_renderer/models/"*.tscn 2>/dev/null | xargs -I{} basename {} .tscn
+    ls "$PROJECT/models/"*.tscn 2>/dev/null | xargs -I{} basename {} .tscn
     exit 1
 fi