[ot][spam][crazy] crazylog: append-only random-access data

[Undiscussed Horrific Abuse, One Victim of Many]

so things are split between chunk regions and flush regions
makes for a stronger cognitive challenge, to change the source in
multiple concepts at once
i guess it's just inspiring to add in names that seem a little more intuitive.
it is of course confusing that both are 'regions', when juggling
memory fragments