feat: Implement core player entity with multiplayer state synchronization, character selection, movement, and manager-based input.

scenes/player.gd

@@ -13,6 +13,7 @@ var powerup_manager
 var score: int = 0
 
 signal position_changed
+signal tekton_carried_changed(is_carrying)
 
 # Display name (synced across network)
 var _display_name: String = ""
@@ -46,6 +47,7 @@ var is_carrying_tekton: bool:
 	get: return is_carried_tekton
 	set(value):
 		is_carried_tekton = value
+		emit_signal("tekton_carried_changed", value)
 		# Visual/Logic side effects if any
 
 var is_carried_tekton: bool = false
@@ -2126,20 +2128,19 @@ func update_active_player_indicator():
 		sync_modulate(color) # Apply locally if offline/not ready
 
 func knock_tekton():
-	# ... legacy or helper function ...
-	pass
 	if not is_multiplayer_authority() or is_frozen or is_stop_frozen:
 		return
 		
-	# Requirement: Full Powerup Bar
-	if not powerup_manager or not powerup_manager.can_use_special():
+	# Requirement: Full Powerup Bar (or we are already in knock mode)
+	if not is_knock_mode and (not powerup_manager or not powerup_manager.can_use_special()):
 		NotificationManager.send_message(self , "Need Full Boost to Knock!", NotificationManager.MessageType.WARNING)
 		return
 		
 	var tekton = _find_nearby_tekton()
 	if tekton:
-		# Consume Boost
-		powerup_manager.consume_boost(100.0)
+		# Consume Boost if we haven't already (or just consume it now if we are in mode)
+		if powerup_manager:
+			powerup_manager.consume_boost(100.0)
 		
 		if is_multiplayer_authority():
 			rpc("sync_knock_tekton", tekton.get_path())
@@ -2148,6 +2149,10 @@ func knock_tekton():
 		is_knock_mode = false
 		NotificationManager.send_message(self, "Knock Successful!", NotificationManager.MessageType.POWERUP)
 		update_active_player_indicator()
+	else:
+		# If we called knock_tekton but nothing was nearby, maybe we just enter the mode?
+		# But usually this is called by movement_manager which knows something is there.
+		pass
 
 @rpc("any_peer", "call_local", "reliable")
 func sync_knock_tekton(tekton_path: NodePath):