Tells an agent (or anyone) how Surfex works, from the installed version (§21).
mix surfex.info # the directory: what Surfex is, the topics, every command
mix surfex.info process # one topic's pageAn unknown topic fails, naming the topics. The agent topic is the package's
usage-rules.md, the short page mix usage_rules.sync copies into a project's
AGENTS.md, which points back here for the rest.