Expose feature freeze date in python-releases.json API

[m-aciek]

Feature freeze date is used to be point of docs translations start for a release (at least for those using translation platform). Having the date would allow to base the automations on release-cycle.json file.

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📚 Documentation preview 📚: https://pep-previews--4698.org.readthedocs.build/

[hugovk]

Feature freeze is defined as beta 1, which is already exposed in the full https://peps.python.org/api/pythonreleases.json

For example:

      {
        "stage": "3.15.0 beta 1",
        "state": "expected",
        "date": "2026-05-05",
        "note": ""
      },

Can you use this instead?

[m-aciek]

It's accessible even easier, in the metadata part:

    "3.15": {
      "pep": 790,
      "status": "feature",
      "branch": "main",
      "release_manager": "Hugo van Kemenade",
      "start_of_development": "2025-05-07",
      "feature_freeze": "2026-05-05",
      "first_release": "2026-10-01",
      "end_of_bugfix": "2028-10-01",
      "end_of_life": "2031-10-01"
    }

Thank you for the pointer.