feat(wiring): MobSpawner integration + take_damage API on dolphin

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/dolphin/DolphinController.gd

@@ -250,6 +250,13 @@ func _raycast(reach: float) -> Dictionary:
 	return result
 
 
+func take_damage(amount: float) -> void:
+	health = max(0.0, health - amount)
+	emit_signal("stats_changed", oxygen, health, hunger)
+	if health <= 0.0:
+		emit_signal("player_died")
+
+
 func _trigger_echolocation() -> void:
 	if is_echolocating:
 		return