APIs:
cumulo-util.core/on-page-touch $ fn ()
cumulo-util.core/visibility-heartbeat $ fn ()
cumulo-util.file/sh! "|echo demo"
cumulo-util.file/write-mildly! path content
cumulo-util.file/get-backup-path!
cumulo-util.file/merge-local-edn! base filepath $ fn (found?)MIT