Console noise purge: deprecated-API fixes + PixelArtDevControls legacy-Input exception

MenuUi FindAnyObjectByType; GA prefabAssetPath->assetPath x2; Synty sample
FindObjectsByType overload; dead death_b field removed. Real bug caught by
the sweep: the F3 pixel-art toggle used legacy Input.GetKeyDown under
Input System-only handling -> InvalidOperationException every frame in Play.
Suite green (455).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/Synty/PolygonDog/Scripts/POLYGON_DogAnimationController.cs

@@ -1,4 +1,4 @@
-/*
+/*
  * POLYGON DOG ANIMATION SCRIPT
  * DESCRIPTION: This script demonstrates the range of animations and Prefabs included in 
  * Polygon Dog which can be customized for the users preference. Please attach this to the
@@ -83,7 +83,6 @@ public class POLYGON_DogAnimationController : MonoBehaviour
     public float timeRemaining = 1.0f;
     private int countDown = 1;
     bool Movement_f;
-    bool death_b = false;
     bool Sleep_b = false;
     bool Sit_b = false;
     private float w_movement = 0.0f; // Run value