create, update or remove.
Its text after. null removes it.
The agent it is for, or shell for the startup file.
Its text now. null when it does not exist.
The file.
OptionalmodeThe file's mode, for a file that holds a key.
OptionalskillTrue for the skill: pai's own file, so it gets no backup and no diff.
One file setup changes, with its text before and after.