Function missing_blocker_hold_reason 

pub fn missing_blocker_hold_reason(
    blocked_by: &[String],
    missing: &[String],
) -> String

The hold_reason text for a task quarantined because one or more of its blocked_by ids no longer exist. Shared by crate::daemon::resolve_blockers, crate::triage::run_once, and Queue::remove’s own dependent quarantine, so the three call sites read as the same event to an operator looking at magi task show rather than three different wordings for it.

Names the full original blocked_by list, not just missing - a task quarantined here can also have named a dependency that was still perfectly valid, and Task::hold_machine clears blocked_by on the way in, so this text is the only place that information survives for an operator deciding whether to release the task outright.