converters: Testkorpus und Harness ziehen nach torben/chemenu-testfiles, Workflow Converters mit Pfad-Trigger, Release-Gate (#232); 10.1.0-beta.2

Files changed:
- .gitattributes
- .gitea/workflows/converters.yml
- .gitea/workflows/release.yml
- .gitignore
- CHANGES.md
- VERSION
- docs/dev/development.md
- instructions/dev/dev-setup.md
- instructions/dev/publish-and-ci.md
- instructions/dev/testing-conventions.md
- testfiles/README.md
- testfiles/mail/github-outlook.msg
- testfiles/mail/github-roundcube.eml
- testfiles/mail/gog-outlook.msg
- testfiles/mail/gog-roundcube.eml
- testfiles/mail/gog-roundcube.eml.expect
- testfiles/mail/tldr-outlook.msg
- testfiles/mail/tldr-roundcube.eml
- testfiles/office/excel-artificial.xlsx
- testfiles/office/excel-business.xlsx
- testfiles/office/excel-business.xlsx.expect
- testfiles/office/excel-science.xlsx
- testfiles/office/pptx-baseline.pptx
- testfiles/office/pptx-master.pptx
- testfiles/office/pptx-objects.pptx
- testfiles/office/word-complex.docx
- testfiles/office/word-simple.docx
- testfiles/pdf/einstein-dissertation.pdf
- testfiles/pdf/ifg.pdf
- testfiles/pdf/nist-ai-rmf.pdf
- testfiles/pdf/nist-ssdf-genai.pdf
- testfiles/zip/archive.zip
- tools/chemenu/tests/test_raw_derive_testfiles.py

Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

instructions/dev/dev-setup.md

@@ -40,6 +40,7 @@ development material under `instructions/dev/` and `commonplace/`, and no
    | `USER.md`/`SOUL.md` describe a demo operator and persona | Written by the operator during setup |
    | `tools/wikitool dist upgrade` refuses: there is no stamp to compare against. The checkout follows `main` with `tools/wikitool sync` | Updated with `dist upgrade --latest` |
    | `instructions/dev/`, `docs/dev/`, `commonplace/` and `.gitea/` are present | Never shipped |
+   | `testfiles/` may hold the private test corpus (step 6) | Never present |
 
 5. **Use `dist export` as a build and test tool.** It writes exactly the tree a release ships, so
    it is how a change to the shipped surface is looked at before it is released:
@@ -56,6 +57,23 @@ development material under `instructions/dev/` and `commonplace/`, and no
    `.gitea/workflows/ci.yml` is that replay and the reference for it. Keep scratch trees outside
    this checkout.
 
+6. **Clone the private test corpus, if you have access.** The real documents the converters are
+   tested against, and the harness that runs them, are a repository of their own and not part of
+   this one:
+
+   ```bash
+   git clone ssh://git@gitea.nehmer.net:10101/torben/chemenu-testfiles.git testfiles
+   cd tools && .venv/bin/python -m pytest -c pytest.ini ../testfiles/harness
+   ```
+
+   The clone sits in `testfiles/`, which `.gitignore` excludes; it is deliberately not a
+   submodule. Without access nothing breaks: `pytest` in `tools/` needs none of it, and a
+   session that changes a converter leaves the real-document run to the `converters` workflow
+   ([publish-and-ci.md](publish-and-ci.md) step 3). What is missing without the clone is the
+   local run of that harness, nothing else. The corpus holds files that may not be public, so
+   nothing from it is copied into this repository, an issue or a bug report without its README
+   saying the file could be public.
+
 ## Decision points
 
 - **Asked to set up an instance from this checkout** (`dist export` into the user's folder, or a