Add scripted event withdrawals

scripts/core/battle_state.gd

@@ -3648,6 +3648,15 @@ func _execute_event_action(action: Dictionary, trigger_unit: Dictionary = {}) ->
 			return
 		for deployment in deployments:
 			_spawn_event_deployment(deployment)
+	elif action_type == "withdraw_unit":
+		_withdraw_event_unit(str(action.get("unit_id", action.get("id", ""))))
+	elif action_type == "withdraw_units":
+		var unit_ids = action.get("unit_ids", [])
+		if typeof(unit_ids) != TYPE_ARRAY:
+			push_error("Skipping malformed withdrawal list in %s." % battle_id)
+			return
+		for unit_id in unit_ids:
+			_withdraw_event_unit(str(unit_id))
 
 
 func _grant_event_items(item_entries, trigger_unit: Dictionary = {}) -> void:
@@ -3781,6 +3790,25 @@ func _spawn_event_deployment(deployment) -> bool:
 	return true
 
 
+func _withdraw_event_unit(unit_id: String) -> bool:
+	var normalized_id := unit_id.strip_edges()
+	if normalized_id.is_empty():
+		push_error("Skipping event withdrawal with no unit_id in %s." % battle_id)
+		return false
+	var unit := get_unit(normalized_id)
+	if unit.is_empty() or not unit.get("deployed", true) or not unit.get("alive", false):
+		return false
+	if selected_unit_id == normalized_id:
+		selected_unit_id = ""
+	_emit_combat_feedback(unit, "WITHDRAW", "fade")
+	unit["deployed"] = false
+	unit["acted"] = true
+	unit["moved"] = true
+	_emit_log("%s withdraws from the battlefield." % unit.get("name", normalized_id))
+	_notify_changed()
+	return true
+
+
 func _reset_team_actions(team: String) -> void:
 	_apply_phase_status_effects_for_team(team)
 	_check_battle_status()