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process_queue() unwrapped four guest-reachable Results. Convert each unwrap to a logged error path. A failed status write is demoted to len = 0 so the head is still retired via add_used; an add_used failure breaks the batch (queue is in a bad state); a needs_notification failure signals; a signal failure is logged. The daemon stays up. Signed-off-by: Dylan Reid <dgreid@fb.com>