Developers keep rebuilding the same fragile in-house scheduler because cron has no retry, no locking, and no observability

Developers running scheduled jobs on plain cron rebuild the same missing pieces every time: a retry loop when the job fails, a lock to stop two instances stomping each other, a log of which runs succeeded or failed, and an alert when something breaks at 3am. Temporal solves this but costs a full workflow engine and a cluster, and Kubernetes CronJobs need a cluster too. Healthchecks.io and Cronitor ping a URL after the job runs but cannot retry or re-execute it. This is a single static binary that wraps any existing crontab entry and adds retry-with-backoff, a file or Redis-backed distributed lock, a local run log with exit codes and duration, and webhook or PagerDuty alerting on failure, with no framework, no cluster, and no code change to the job itself.