translation-status: the verification fixture is not in the repo

[mairas]

translation-status.yml was verified by building a two-page, one-locale
mkdocs-static-i18n tree on a throwaway branch, running it through four
scenarios, and deleting the branch. The run IDs are in
#39; Actions logs
expire after 90 days and the fixture is gone already.

The next person to touch the PATCH/POST branch, the PIPESTATUS handling or
the steps.anchors.outcome condition has no way to re-run any of it without
rebuilding the fixture by hand, so they will not.

examples/docs-repo/ is the natural home. It needs mkdocs.yml with two
locales, docs/en/ and one translation with translated_from stamps,
pyproject.toml pinning halos-docs-tools, and a README saying how to reach
each state: edit an English page for stale, remove the stamp for unstamped,
add an English page for missing, delete one for orphaned, break a fragment
for the anchor path, drop pull-requests: write for the read-only token.

Open question worth deciding first: whether to commit uv.lock with it. The
workflow runs uv sync --locked, so a fixture without one cannot be driven by
the workflow unchanged, and uv.lock for a mkdocs-material project is around
110 KB.