docs: clarify unsupported Python 3.14 installs

[extrasmall0]

Summary

• document the current Python 3.10-3.13 support window in the README
• align the conda example with that documented support range

Testing

• python3 - <<"PY"
  import pathlib
  text = pathlib.Path("README.md").read_text()
  assert "Python 3.10-3.13" in text
  assert "python>=3.10,<3.14" in text
  print("ok")
  PY

Closes #1759

[github-actions]

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[extrasmall0]

I have read the DCO Document and I hereby sign the DCO

[wadeKeith]

Withdrawn; this review was too cursory.

[extrasmall0]

Thanks for flagging the maintenance concern. That was a fair point on the earlier revision.

The current head no longer changes pyproject.toml or installer constraints. The branch is now limited to the README/docs note about Python 3.14 not being a supported install target, plus the matching conda example, and that cleanup is in 52ae229.

If you review the latest diff rather than the original version, I think the remaining question is just whether you want that clarification in the docs. If there is still a concrete concern with the current README-only change, I would appreciate the specific edge case to address.

[jmartin-tech]

This PR is under discussion by the project based on forward maintenance expectations. This is not a docs only change as the impact to pyproject.toml will change how pip applies restrictions on installation even for developers that may be evaluating preview python versions. The review mentioned was not by a project member and is suspected to not even have been a human review so lacks context of the possible impacts and restrictions added by this PR.