Add support for Python 3.15

[hagenw]

Add support and tests for Python 3.15.

🤖 Generated with Claude Code

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The pull request adds Python 3.15 to the package support metadata and CI matrix, configuring GitHub Actions to discover and test the latest interpreter—including prerelease builds—on Ubuntu, Windows, and macOS.

File-Level Changes

Change	Details	Files
Expand automated testing to cover Python 3.15 across supported operating systems, including prerelease/latest interpreter resolution.	Add Python 3.15 to the CI version matrix. Enable prerelease downloads and latest-version checks in Python setup.	.github/workflows/test.yml
Declare Python 3.15 as a supported package runtime.	Add the Python 3.15 trove classifier while retaining the existing minimum Python requirement.	pyproject.toml

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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