ci: streamline supported Python coverage

[Alpha9463]

Summary

Retires Python 3.10 support and aligns package metadata, documentation, and CI with Python 3.11–3.14. CI now runs the full suite on the oldest and newest supported versions, with wheel-install and public smoke coverage on intermediate versions.

Related Issues

Closes #559

Changes

• Raise the package requirement to Python 3.11 and remove the Python 3.10 classifier.
• Set Ruff’s target version to Python 3.11.
• Update support wording and preview-module documentation.
• Update actions/checkout and actions/setup-python to v7.
• Run the complete suite on Python 3.11 and 3.14.
• Install .[dev,pdf] from binary wheels and run public render and CLI smoke checks on Python 3.12 and 3.13.
• Keep the release workflow on the same reusable CI gates.
• Replace long workflow commentary with concise operational comments.

How to Test

1. Validate the workflows:

   actionlint .github/workflows/ci.yml .github/workflows/release.yml

2. Run the local suite and static checks:

   python3 -m pytest -q --durations=50 --disable-warnings
   python3 -m ruff check .
   python3 -m ruff format --check tests
   python3 -m mypy pandid
   python3 -m pyright pandid

3. Confirm the pull-request matrix passes:

   • Full tests: Python 3.11 and 3.14.
   • Public smoke tests: Python 3.12 and 3.13.
   • Linting and type checks: Python 3.12.

Evidence

• actionlint passes for both workflows.
• Public API rendering and pandid --help smoke checks pass locally.
• Complete local Python 3.14 suite: 11462 passed, 190 skipped in 57.72s.
• Ruff, formatting, mypy, Pyright, and git diff --check pass locally.
• The CI duration and Python 3.11–3.13 coverage will be confirmed by this pull request’s Actions run.

Checklist

• Base branch is main
• Branch is mergeable
• Commit subjects follow Conventional Commits and link tracked work
• Self-reviewed the full diff
• Relevant local checks pass
• All CI jobs pass
• Documentation updated for the changed support policy and workflow
• No rendered output changed, so before/after drawings are not applicable
• No blocking review feedback remains