OpenClaw gateway killed on update but LaunchAgent fails to restart (regression v2026.3.12)

Every OpenClaw release breaks something. v2026.3.22 broke the Dashboard and WhatsApp. v2026.3.2 silently disabled all agent tools. v2026.3.8 killed cron jobs and compaction. v2026.3.28 permanently broke the exec tool in a way that downgrading could not fix. Users discover these regressions after upgrading their production instance. There is no pre-upgrade testing, no rollback plan, and no way to know if a new version will break your specific configuration. This tool creates a sandboxed replica of your OpenClaw setup, runs the upgrade there first, executes your critical workflows against it, and gives you a pass/fail verdict before touching production.