Neither root is a property of the preset layer. `Config.roots` defaults to `[]`;
the two the shipped agent sees are patched in by the dsh CLI, whose user root is
`dshHomePath('.agent-presets')` and whose system root ships beside the install.
`writableRoot()` then takes the first `user` root from whatever configuration
supplied it.
The skill and the persona stated `${DSH_HOME:-$HOME/.dsh}/.agent-presets/<id>/`
as where authored presets live, which is only the default install's answer, and
no call reports either root: `authorable` says whether a writable one exists,
and `list()` cannot reveal a user root that is still empty. Both now keep that
path as what to tell a user asking where to look, and direct every path an agent
acts on to `list()` or `resolve()` — which is also what `copy()` already relies
on, since it chooses the writable root itself and reports the file it created.
Yichen Jiang
782d670f24