Add support for Python 3.14

[Copilot]

This PR adds support for Python 3.14 to the project by updating the package metadata and CI test matrix.

Changes

Package Metadata (pyproject.toml)

• Added "Programming Language :: Python :: 3.14" classifier to advertise Python 3.14 support in package metadata (e.g., on PyPI)

CI/CD (/.github/workflows/ci.yml)

• Extended the test matrix to include Python 3.14, ensuring the package is tested against this version on Ubuntu, macOS, and Windows

Verification

• ✅ All existing tests pass with these changes
• ✅ Configuration files validated successfully (pyproject.toml and YAML syntax)
• ✅ No breaking changes or modifications to existing functionality

Context

Python 3.14 is now available, and this update ensures the project template stays current with the latest Python releases. The changes are minimal and only extend the existing version support lists without modifying any code functionality.

Original prompt

Add suport for python 3.14

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.