Moving it out of the build left it with no way in. Settings can only install
from the community catalogue, so a first-party extension that isn't bundled
has a working update channel and no first copy for anyone to update — the
mechanism was all there and the front door was missing.
So it goes back beside screenshot, aegis and pdf-editor: seeded into every
profile by the build, listed under "Built into Theseus", and kept current
between releases by the operator-signed channel at
theseus.x/extensions/docx-editor/. That is the arrangement docs/ADDON-UPDATES.md
describes, and the one the signing script was written for.
About 400 KB compressed in the installer, most of it the vendored editor
libraries — next to the ~4 MB of pdf.js that pdf-editor already ships, the
weight argument for keeping it out didn't survive contact with the numbers.
The end-to-end driver goes back to checking that a fresh profile seeds it,
which is the property that actually matters now.
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