feat(tools): ✨ Update ai-arena.sh to support new screenshot capture/processing requirements with CLI flags or environment variables for resolution, format, and metadata compliance

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

tools/ai-arena.sh

@@ -198,6 +198,7 @@ for ((i = 0; i < N; i++)); do
         --env=AI_ARENA_RESULTS_DIR="$RESULTS_DIR" \
         --env=AI_ARENA_P1_NAME="$P1" \
         --env=AI_ARENA_P2_NAME="$P2" \
+        --env=AI_ARENA_SCREENSHOT_TURN="${AI_ARENA_SCREENSHOT_TURN:-0}" \
         org.godotengine.Godot \
         --path "$GAME_DIR" \
         --rendering-method gl_compatibility \