Summary

• Align the stable branch with the FastAPI 0.140.0 dependency already validated on develop.
• Publish MetaLens 0.2.9 so main and develop differ only where intended.
• Preserve the beta/stable changelog split while removing the remaining functional drift.

Validation

• npm --prefix frontend run build
• python\.venv\Scripts\python.exe -m pytest python/tests/ -v
• npm --prefix electron audit --audit-level=low
• GitHub Actions Build & Release: success on develop
• GitHub Actions CodeQL: success on develop