Update Hunter sprint tuning, animations and scene authoring

Content/authoring changes:
- Hunter prefab: set sprintSpeedMultiplier override to 2
- Paintman-Star animation + UMotion project edits
- SampleScene: prefab override / FirstPersonTarget cleanup

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

Assets/Scenes/SampleScene.unity

@@ -4063,37 +4063,11 @@ MeshCollider:
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@@ -4659,11 +4633,6 @@ Transform:
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@@ -7865,20 +7834,17 @@ PrefabInstance:
       propertyPath: m_Name
       value: Player
       objectReference: {fileID: 0}
-    - target: {fileID: 3510981371713521867, guid: cf153a3aea3d5da4f9d4cdbff0be8180, type: 3}
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-    - target: {fileID: 8381518232634759850, guid: cf153a3aea3d5da4f9d4cdbff0be8180, type: 3}
-      propertyPath: sprintSpeedMultiplier
-      value: 2
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-      insertIndex: -1
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+    m_AddedGameObjects: []
     m_AddedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: cf153a3aea3d5da4f9d4cdbff0be8180, type: 3}
 --- !u!4 &5297240775790447668 stripped