chore: require Python 3.10

[bednar]

Summary

• Raise the minimum supported Python version from 3.9 to 3.10.
• Use setuptools 84+, update CircleCI defaults/matrix, and remove the Python 3.9 classifier.
• Document the breaking runtime requirement.

Verification

• circleci config validate .circleci/config.yml
• Built a wheel on Python 3.10 with Requires-Python: >=3.10.
• Confirmed Python 3.9 cannot install the project with the new build requirement.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.94%. Comparing base (d846df5) to head (3df45e1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
+ Coverage   86.90%   86.94%   +0.04%     
==========================================
  Files          28       28              
  Lines        2084     2084              
==========================================
+ Hits         1811     1812       +1     
+ Misses        273      272       -1     

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[Copilot]

Pull request overview

Raises the minimum supported Python version from 3.9 to 3.10 across packaging, documentation, changelog, and CI.

Changes:

• Requires Python 3.10+ and setuptools 84+.
• Removes the Python 3.9 classifier.
• Updates CI versions and documents the breaking change.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
setup.py	Updates Python requirement and classifiers.
README.md	Documents Python 3.10 minimum.
pyproject.toml	Raises setuptools build requirement.
CHANGELOG.md	Records the breaking change.
.circleci/config.yml	Updates CI defaults and test matrix.

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