feat: add DMG build script and enhance README with installation instructions and Start at Login feature

apps/mac/AIWorkspace/Sources/main.swift

@@ -1,5 +1,6 @@
 import AppKit
 import Foundation
+import ServiceManagement
 import SwiftUI
 
 private let workspaceRoot = URL(fileURLWithPath: "/Users/david/Developer/fidelity-ai-workspace", isDirectory: true)
@@ -27,6 +28,7 @@ final class ServiceStatusModel: ObservableObject {
     @Published private(set) var report: StatusReport?
     @Published private(set) var lastError: String?
     @Published private(set) var lanIP: String?
+    @Published private(set) var loginItemStatus: SMAppService.Status = .notRegistered
     @Published private(set) var isRefreshing = false
 
     let profile: String
@@ -53,12 +55,42 @@ final class ServiceStatusModel: ObservableObject {
             let data = try await ServiceManager.run(["status", "--profile", profile, "--json"])
             report = try JSONDecoder().decode(StatusReport.self, from: data)
             lanIP = await NetworkInfo.primaryLANIP()
+            loginItemStatus = SMAppService.mainApp.status
             lastError = nil
         } catch {
             lastError = String(describing: error)
         }
     }
 
+    var startAtLoginEnabled: Bool {
+        loginItemStatus == .enabled
+    }
+
+    var startAtLoginStatusText: String {
+        switch loginItemStatus {
+        case .enabled: "enabled"
+        case .notRegistered: "off"
+        case .notFound: "not found"
+        case .requiresApproval: "requires approval"
+        @unknown default: "unknown"
+        }
+    }
+
+    func setStartAtLogin(_ enabled: Bool) {
+        do {
+            if enabled {
+                try SMAppService.mainApp.register()
+            } else {
+                try SMAppService.mainApp.unregister()
+            }
+            loginItemStatus = SMAppService.mainApp.status
+            lastError = nil
+        } catch {
+            loginItemStatus = SMAppService.mainApp.status
+            lastError = "Start at Login: \(error.localizedDescription)"
+        }
+    }
+
     func startProfile() {
         runAction(["start", "--profile", profile])
     }
@@ -219,6 +251,21 @@ struct ServiceMenuView: View {
 
             ActionButton(title: "Open Project Knowledge", systemImage: "books.vertical", action: model.openProjectKnowledge)
 
+            Divider()
+            VStack(alignment: .leading, spacing: 6) {
+                Toggle(isOn: Binding(
+                    get: { model.startAtLoginEnabled },
+                    set: { model.setStartAtLogin($0) }
+                )) {
+                    Label("Start at Login", systemImage: "poweron")
+                }
+                .toggleStyle(.switch)
+
+                Text("Login item: \(model.startAtLoginStatusText)")
+                    .font(.caption2)
+                    .foregroundStyle(.secondary)
+            }
+
             Divider()
             HStack {
                 if let error = model.lastError {