* Use Python 3.14(.3) in CI and base image
Update base image to the latest tag using Python 3.14.3 and update Python
version in CI workflows to 3.14.
With Python 3.14, backports.zstd is no longer necessary as it's now available
in the standard library.
* Update wheels ABI in the wheels builder to cp314
* Use explicit Python fix version in GH actions
Specify explicitly Python 3.14.3, as the setup-python action otherwise default
to 3.14.2 when 3.14.3, leading to different version in CI and in production.
* Update Python version references in pyproject.toml
* Fix all ruff quoted-annotation (UP037) errors
* Revert unquoting of DBus types in tests and ignore UP037 where needed
It seems that agents like Claude like to do absolute imports despite it's a
pattern we're trying to avoid. Adjust the instructions to avoid them doing it.
* Add GitHub Copilot/Claude instruction
This adds an initial instruction file for GitHub Copilot and Claude
(CLAUDE.md symlinked to the same file).
* Add --ignore-missing-imports to mypy, add note to run pre-commit
