Switch to Deferred+ with dedicated forward renderer for radar camera; rendering-layer setup across scenes

Also serializes wallStepOffset on Player prefab and includes SliderDoubleClickReset wiring in Main (mixed scene edits).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/Prefabs/Player.prefab

@@ -143,6 +143,7 @@ MonoBehaviour:
   wallOffsetFollow: 12
   wallExitGrace: 0.15
   wallTopOutConfirm: 0.06
+  wallStepOffset: 0.1
   ceilingGrabDistance: 0.02
   wallTopOutBoost: 0.3
   noClimbTag: NoClimb
@@ -406,6 +407,10 @@ PrefabInstance:
       propertyPath: m_CastShadows
       value: 0
       objectReference: {fileID: 0}
+    - target: {fileID: 5804137883901333613, guid: c2044ff1352a6bb4586d6d04b59012b7, type: 3}
+      propertyPath: m_RenderingLayerMask
+      value: 2
+      objectReference: {fileID: 0}
     - target: {fileID: 5804137883901333613, guid: c2044ff1352a6bb4586d6d04b59012b7, type: 3}
       propertyPath: 'm_Materials.Array.data[0]'
       value: