Copyright LINUXexpert-org. LICENSE is the canonical FSF text from
gnu.org/licenses/gpl-3.0.txt verbatim, not a reflowed or paraphrased copy,
and README gains the standard notice.
GPLv3 rather than the AGPLv3 used by cairnobs: this is a command-line tool,
so AGPL's network clause - the whole reason to reach for AGPL over GPL - has
nothing to attach to here.
No per-file SPDX headers, matching this workspace's existing convention.
Nothing is vendored: the tool is standard library only, and migrate_v016.py
is fetched from Stalwart at runtime rather than redistributed.
