M1: wire shove ball + follow camera into M1_Arena

- ShoveBall: in-scene NetworkObject sphere (1.5m, 10kg, drag 0.5) at
  (0,0.75,6), host-authoritative via NetworkRigidbody/NetworkTransform,
  ShoveBall.physicsMaterial (friction 0.4/0.5, bounce 0.3). No script.
- FollowCamera on Main Camera, target=Bot, offset (0,8,-12).
- Solo host smoke test passed: ball spawns + rests on ground + shoves;
  camera frames the bot.

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

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