Variable SWEEP_NAMESConst

Names of the background jobs run each cycle, and the sole definition SweepName is derived from. as const (not an enum) freezes the array and keeps the literal types.

Array order is both run order and result order, and the order matters. feeSweep follows treasury because one measures the surplus and the next moves it, so keep the pair adjacent. checkpointVerify runs before checkpoint so it re-checks the old sealed snapshot before a fresh one overwrites it; a just-taken snapshot always passes. drainInbox sits next to its outbound mirror relay and is never gated on the pause, so settlements keep flowing during a maintenance window.