For agents, on top of README.md, which they read first.

• The drawing is pure: a network and what is known in, markup out. It draws Network<D> and nothing beside it; never add a way to give it rules that are not the ones that run.
• No host in it. Names, captions and words for effects come from the Domain and the host's Legend.
• The markup is a contract with the hosts' stylesheets. Changing a class, an element or the order of the nodes changes every host's picture: lmjtfy holds its /rules.svg byte for byte to what it served before the drawing moved here, so run its tests after touching this.