* fix(fs): allow open, seek and fstat in the write permission sets
The stream path of writeFile calls `open`, which only the nested command
list of `allow-write-file` granted (plugins/fs/permissions/write-all.toml,
write-files.toml), so `fs:allow-appdata-write-recursive` and the other
write sets rejected streamed writes; seek/fstat were missing for
FileHandles created under these sets.
Adds open, seek and fstat to write-all and write-files. This widens the
write sets slightly (open is already implied by allow-write-file); the
generated reference does not list set members, so nothing to regenerate.
* use dependencies instead