Disable foot IK on pose playables and add ball pose

- PlayerPoseController: add applyFootIK toggle (default off) and apply it
  to each pose playable so straight-knee idles render straight; Mecanim
  foot IK was bending the knees to plant the feet (162° instead of 180°).
- Add Pose_Ball / Paintman-Ball animation and reorder the pose list.
- Move StraightenKneesTool editor utility under Assets/Unused/Editor.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scripts/PlayerPoseController.cs

@@ -58,6 +58,11 @@ public partial class PlayerPoseController : MonoBehaviour
     [Min(0f)]
     [SerializeField] private float ceilingOffsetSpeed = 4f;
 
+    [Tooltip("Apply Mecanim foot IK to the played humanoid clips. Off (default) plays each pose exactly as " +
+             "authored. On bends the knees to plant the feet on the IK goal, which makes a straight-knee idle " +
+             "render visibly bent even when the clip's Lower Leg Stretch muscle is fully straight.")]
+    [SerializeField] private bool applyFootIK = false;
+
     private PlayerCharacterController _player;
     private Animator _animator;
     private string _graphName; // cached so building the graph allocates no string from the Update path
@@ -269,6 +274,10 @@ public partial class PlayerPoseController : MonoBehaviour
         }
 
         _toPlayable = AnimationClipPlayable.Create(_graph, clip);
+        // Off by default: foot IK plants the foot on its goal and bends the knee to reach it, so a straight-knee
+        // pose renders bent (SampleAnimation, which the authoring tools check against, never applies it). The
+        // outgoing pose on input 0 is a former _toPlayable, so it already carries this setting.
+        _toPlayable.SetApplyFootIK(applyFootIK);
         _mixer.ConnectInput(1, _toPlayable, 0);
         _toClip = clip;