Optional Oban cron worker that runs the inbound retention sweep (IOPS-03, D-49-28). The batched workhorse lives in MailglassInbound.Internal.Prune; this worker's perform/1 just delegates to prune/0.

Optional-dep gating

The entire module is conditionally compiled behind if Code.ensure_loaded?(Oban.Worker). When Oban is absent a stub is defined exposing available?/0 -> false; MailglassInbound.Application emits a consolidated boot warning directing operators to run mix mailglass.inbound.prune from their own cron infrastructure.

Never auto-registered

This worker is NOT auto-registered in MailglassInbound.Application (D-49-28). Operators wire the cron in their own Oban config — the recommended cadence is 0 3 * * * (3 AM UTC; documented in the Phase 50 operator guide). The mix mailglass.inbound.prune task runs the sweep synchronously whether or not Oban is present, so Oban-less adopters still get a working prune.