Struct ApplyProgress 

pub(super) struct ApplyProgress<'a> {
    pub on_start: &'a dyn Fn(&str, &str),
    pub on_done: &'a dyn Fn(&str, u64),
}

Per-migration progress hooks. Two real implementations: the CLI’s NDJSON stdout lines (run_migrate_command), and — since this PR — run_pending_migrations’s AGENTMUXSRV-MIGRATION-BEGIN/-END stderr lines, which the launcher turns into live splash sub-rows. Both also still get the unconditional tracing lines apply_pending emits regardless of whether a progress hook is passed at all.

Fields

on_start: &'a dyn Fn(&str, &str)

on_done: &'a dyn Fn(&str, u64)