On the node whose compositions carry the bus's list, the engine also watches mesh-grants' key user-list.sealed. While it
says follow grants, the object it names is read by name, opened with this machine's sealing key, checked against the
key's digest and the guard, and written to the same file at 0600 only when its digest differs; the bus reloads it
itself. The have says which list is followed and this machine's sealing key, which the grants part seals to.
The follower's test waits for its watch to catch up before a later put, which raced under load. Pins mesh-sdk 175a5567.
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