feat: add one-step installer script and enhance README with installation instructions

apps/mac/AIWorkspace/README.md

@@ -28,6 +28,12 @@ Install to `~/Applications/AIWorkspace.app`:
 apps/mac/AIWorkspace/scripts/package-app.sh --install
 ```
 
+One-step local install, optionally enabling start at login and opening the app:
+
+```bash
+apps/mac/AIWorkspace/scripts/install.sh --start-at-login --open
+```
+
 ## Start at login
 
 After installing the app bundle:
@@ -55,6 +61,7 @@ swift run --package-path apps/mac/AIWorkspace AIWorkspace
 - Stop Fidelity services
 - Restart Context MCP
 - Open Mattermost through the service manager
+- Open Mattermost through the local proxy-managed launcher
 - Run Doctor
 - Copy Doctor JSON
 - Copy Photo Inbox URL