- Add support for the stable ABI for free-threaded interpreters (``abi3t``).
- Add support for the stable ABI extension modules' platform-specific filename
  suffixes introduced in Python 3.15.
- Allow specifying ``editable-verbose`` in ``pyproject.toml``.
- Improve the default behavior of editable installs by capturing and reporting
  build errors when rebuilding.
- Use ``.start`` files (PEP 829) instead of ``.pth`` files to implement editable
  wheels for Python 3.15 and later.