okf ctx edit
usage: okf ctx edit [-h] [--json] slug
open _ctx/<slug>.md in $VISUAL, else $EDITOR, else vi; afterwards refresh the _ctx index and run`ctx check` on the file; exit 1 on errors
positional arguments: slug ctx slug
options: -h, --help show this help message and exit --json print one JSON envelope {command, ok, data, warnings, error}