Arena polish: in-run HUD, no free loot, retire-with-winnings

- HUD arena status (top center): live wave number and run gold,
  driven by GameState signals, torn down cleanly on HUD.reset()
- Free floor weapons removed: the initial sword/shield spawn is gone
  and manually placed level.tscn weapons are deleted server-side at
  init. Gear now only enters play via the armory or enemy drops.
- Retire to Camp: new escape-menu button (shown only while alive in
  an active run) banks 100% of run gold and keeps all gear - the
  counterweight to death's 10% settlement. Exit Game and window close
  also bank winnings before quitting.
- CLAUDE.md rewritten for the gladiator arena era: core loop,
  autoloads, economy API, RPC patterns, verification workflow.

level/ui/scripts/escape_menu.gd

@@ -9,11 +9,27 @@ var is_visible: bool = false
 # Player reference (to control mouse mode)
 var player: Character = null
 
+var _retire_button: Button = null
+
 func _ready():
 	# Start hidden
 	hide()
 	is_visible = false
 
+	# Insert "Retire to Camp" between Resume and Exit - leave alive, bank everything
+	var vbox = get_node_or_null("Panel/MarginContainer/VBoxContainer")
+	var exit_button = get_node_or_null("Panel/MarginContainer/VBoxContainer/ExitButton")
+	if vbox and exit_button:
+		_retire_button = Button.new()
+		_retire_button.name = "RetireButton"
+		_retire_button.custom_minimum_size = Vector2(0, 50)
+		_retire_button.add_theme_color_override("font_color", Color.WHITE)
+		_retire_button.add_theme_color_override("font_hover_color", Color(1, 0.8, 0))
+		_retire_button.add_theme_font_size_override("font_size", 20)
+		_retire_button.pressed.connect(_on_retire_pressed)
+		vbox.add_child(_retire_button)
+		vbox.move_child(_retire_button, exit_button.get_index())
+
 func _input(event):
 	# Toggle on Escape press
 	if event.is_action_pressed("quit"):
@@ -29,6 +45,7 @@ func toggle_menu():
 	is_visible = !is_visible
 	if is_visible:
 		show()
+		_update_retire_button()
 		# Release mouse when opening menu
 		Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
 	else:
@@ -37,10 +54,35 @@ func toggle_menu():
 		if player and player.is_multiplayer_authority():
 			Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
 
+## Retiring is only possible while alive with an active run
+func _update_retire_button():
+	if not _retire_button:
+		return
+	var can_retire = GameState.run_active and player and not player.is_dead
+	_retire_button.visible = can_retire
+	if can_retire:
+		_retire_button.text = "Retire to Camp (+%dg)" % GameState.run_gold
+
 ## Called when Resume button is clicked
 func _on_resume_pressed():
 	toggle_menu()
 
+## Walk out alive: bank all run gold, keep gear, return to the menu
+func _on_retire_pressed():
+	GameState.retire_run()
+
+	multiplayer.multiplayer_peer = null
+	Network.players.clear()
+
+	if has_node("/root/HUD"):
+		get_node("/root/HUD").reset()
+
+	Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
+	get_tree().reload_current_scene()
+
 ## Called when Exit button is clicked
 func _on_exit_pressed():
+	# Leaving alive still banks your winnings (GameState also catches window close)
+	if GameState.run_active and player and not player.is_dead:
+		GameState.retire_run()
 	get_tree().quit()