feat: opción Restart en TUI dashboard de agentes

Añade botón "Restart" en el menú de acciones de agente en la TUI.
Ejecuta stop + start del launcher unificado para aplicar cambios
de configuración sin salir del dashboard. Incluye intent nuevo
IntentRestartAgent y su implementación en el adapter impuro.

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

pkg/tui/model.go

@@ -89,11 +89,13 @@ func ServerMenuOptions(running bool) []MenuOption {
 func AgentActionOptions(enabled bool) []MenuOption {
 	if enabled {
 		return []MenuOption{
+			{Label: "Restart", Desc: "Reiniciar launcher para aplicar cambios"},
 			{Label: "Disable", Desc: "Desactivar agente (requiere restart)"},
 			{Label: "Logs", Desc: "Ver log del launcher"},
 		}
 	}
 	return []MenuOption{
+		{Label: "Restart", Desc: "Reiniciar launcher para aplicar cambios"},
 		{Label: "Enable", Desc: "Activar agente (requiere restart)"},
 		{Label: "Logs", Desc: "Ver log del launcher"},
 	}

pkg/tui/update.go

@@ -14,6 +14,7 @@ const (
 	// Agent-level
 	IntentEnableAgent  IntentKind = "enable_agent"
 	IntentDisableAgent IntentKind = "disable_agent"
+	IntentRestartAgent IntentKind = "restart_agent"
 
 	// Unified launcher operations
 	IntentStartLauncher   IntentKind = "start_launcher"
@@ -69,6 +70,8 @@ func Update(model Model, msg interface{}) (Model, []Intent) {
 	case MsgActionDone:
 		if m.Err != nil {
 			model.StatusMsg = fmt.Sprintf("Error: %s %s: %v", m.Action, m.AgentID, m.Err)
+		} else if m.Action == "Restart" {
+			model.StatusMsg = fmt.Sprintf("Restart OK — all agents reloaded")
 		} else {
 			model.StatusMsg = fmt.Sprintf("%s %s OK — restart launcher to apply", m.Action, m.AgentID)
 		}
@@ -229,6 +232,9 @@ func executeAction(model Model, action string) (Model, []Intent) {
 	case "Disable":
 		model.StatusMsg = "Disabling " + id + "..."
 		return model, []Intent{{Kind: IntentDisableAgent, AgentID: id}}
+	case "Restart":
+		model.StatusMsg = "Restarting launcher (all agents)..."
+		return model, []Intent{{Kind: IntentRestartAgent, AgentID: id}}
 	case "Logs":
 		model.Screen = ScreenLogs
 		model.LogLines = nil