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

.gitattributes

@@ -11,7 +11,3 @@
 # and normalizing a CRLF source on `git add` would change it.
 /raw/** -text
 /incoming/** -text
-
-# Real documents for the `raw derive` tests are compared byte for byte (an .eml with CRLF
-# included), so nothing under testfiles/ is ever normalized.
-/testfiles/** -text