An HTTP client; label is its address where the transport could name one.
A control surface, named — X-Touch.
The history walking itself back: a sequential step or a selective revert of entry.
An internal handle — autoload, route healing, a controller's own re-drive.
WHO wrote — carried on the write, reported on the commit, and journaled on the entry.
It rides the call and not an ambient "current source", because an ambient is right until two writes interleave and several operators writing at once is this console's whole point. The door that knows who is calling passes it; a door that does not know says nothing, and the entry is honestly unattributed rather than carrying a default that lies.