fix(daemon): add ExitTimeOut to launchd plists to prevent SIGKILL during shutdown

[AprilNEA]

Summary

• Add ExitTimeOut of 45 seconds to both launchd plist files
• Prevents launchd from SIGKILL-ing the daemon during graceful shutdown (default 20s timeout is too short for 5s gRPC drain + 30s VM stop)

Test plan

• Verify arcbox daemon stop completes gracefully without SIGKILL
• Verify macOS system restart doesn't leave stale sockets

Closes ABX-237

[linear]

ABX-237 launchd plists missing ExitTimeOut — SIGKILL during graceful shutdown

[Copilot]

Pull request overview

This PR updates ArcBox’s macOS launchd configuration to allow more time for graceful shutdown, preventing launchd from SIGKILL-ing the daemon mid-stop (notably after gRPC drain + VM shutdown).

Changes:

• Add ExitTimeOut = 45 to the dev LaunchAgent plist for dev.arcbox.daemon.
• Add ExitTimeOut = 45 to the desktop helper’s launchd plist.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
scripts/dev.arcbox.daemon.plist	Adds ExitTimeOut with inline rationale to avoid SIGKILL during longer graceful shutdown.
bundle/com.arcboxlabs.desktop.helper.plist	Adds ExitTimeOut to align helper shutdown behavior with the daemon timeout.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add ExitTimeOut to the production daemon plist

This change sets ExitTimeOut only in the dev helper plist (scripts/dev.arcbox.daemon.plist), but the actual user-installed daemon plist is generated in app/arcbox-cli/src/commands/install.rs (register_daemon_service) and currently contains no ExitTimeOut key, so launchd still uses its default timeout for com.arcboxlabs.desktop.daemon in normal installs. In production/uninstall/restart flows this means the daemon can still be SIGKILLed mid-shutdown, so the stated fix does not take effect for the main path.

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