v2.8.3

What's New

• Skip cron jobs with invalid schedules instead of 500-ing every cron mutation [#243]. A job with an out-of-range schedule field (e.g. hour 45) made every cron enable/disable/update return 500, so the editor kept showing a stale timeout and saves appeared to revert. Malformed schedules are now logged and skipped.
• Edit cron jobs in a modal with live schedule validation [#244]. The pencil opens a dialog (like task and clock time entries) for the schedule, model, output, timeout, cloud flag, and prompt. The schedule field validates as you type against the real scheduler, previewing the next runs and blocking Save on an invalid expression.
• Add an AI assistant to the cron prompt editor [#245] [#246]. A sidebar in the job modal, opened by a sparkles button, asks the advisor model to rewrite the prompt; the change appears as an inline diff you accept, reject, or hand-edit -- a pair-programming feel.