Wire insect controller into scene and update settings

Add the new Player (Variant 2, Hand) with HandIK and the InsectController,
boot directly into Insect mode, and apply Unity-managed serialization updates
to the physics, renderer, and post-process settings assets.

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

Assets/Settings/SampleSceneProfile.asset

@@ -18,10 +18,10 @@ MonoBehaviour:
     m_Value: 0
   threshold:
     m_OverrideState: 1
-    m_Value: 1
+    m_Value: 0.6
   intensity:
     m_OverrideState: 1
-    m_Value: 0.25
+    m_Value: 0.2
   scatter:
     m_OverrideState: 1
     m_Value: 0.5
@@ -71,7 +71,7 @@ MonoBehaviour:
     m_Value: {x: 0.5, y: 0.5}
   intensity:
     m_OverrideState: 1
-    m_Value: 0.2
+    m_Value: 0.1
   smoothness:
     m_OverrideState: 0
     m_Value: 0.2