v0.6.5: ship notifications, autostart, code cleanup

- feat(notifications): embed EmailCLI.app, extract on first use so
  native UNUserNotificationCenter works for brew/cargo/curl installs
- feat(autostart): LaunchAgent install/uninstall/status subcommands
- refactor(daemon): consolidate daemon_sync onto the shared sync path
- chore: delete dead code and the stale notify binary; clippy with
  -D warnings passes
- docs(readme): daemon + autostart + notification-bundle explainer

Author: longevityboris

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "email-cli"
-version = "0.6.4"
+version = "0.6.5"
 edition = "2024"
 description = "Agent-friendly email CLI for Resend"
 license = "MIT"