feat: cron agent binding + doctor UI refresh

apps/macos/Sources/Clawdbot/CronJobEditor.swift

@@ -27,6 +27,7 @@ struct CronJobEditor: View {
 
     @State var name: String = ""
     @State var description: String = ""
+    @State var agentId: String = ""
     @State var enabled: Bool = true
     @State var sessionTarget: CronSessionTarget = .main
     @State var wakeMode: CronWakeMode = .nextHeartbeat
@@ -77,6 +78,12 @@ struct CronJobEditor: View {
                                     .textFieldStyle(.roundedBorder)
                                     .frame(maxWidth: .infinity)
                             }
+                            GridRow {
+                                self.gridLabel("Agent ID")
+                                TextField("Optional (default agent)", text: self.$agentId)
+                                    .textFieldStyle(.roundedBorder)
+                                    .frame(maxWidth: .infinity)
+                            }
                             GridRow {
                                 self.gridLabel("Enabled")
                                 Toggle("", isOn: self.$enabled)