v0.14.1

Bug fixes

• Made the loopback demo ignore proxy environment variables. It now stays local even when a
  corporate proxy is configured without a localhost exception; normal agent runs remain
  proxy-aware.

Documentation

• Linked the uv installation instructions and updated the Action example to v0.14.1.

Maintenance

• Changed the release workflow to prepare a titled draft with assets after PyPI publication, so
  Marketplace metadata and categories can be reviewed before publishing. CONTRIBUTING documents
  the manual step.
• Kept the live proxy regression in normal CI but outside mutmut's instrumented test selection;
  the new runner path kills all four of its generated mutants.