Use pytest-beartype-tests plugin

[adamtheturtle]

This PR adds the pytest-beartype-tests dev dependency and removes redundant pytest_collection_modifyitems / @beartype wiring from conftest where it duplicated the plugin.

The plugin registers via pytest11 and applies @beartype to collected test functions, matching the previous local hook behavior (see the upstream README).

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Note

Low Risk
Low risk: changes are confined to the test configuration and dev dependencies, but could affect CI/test behavior if the plugin differs from the previous hook.

Overview
Replaces the local pytest_collection_modifyitems + @beartype wiring in conftest.py with the pytest-beartype-tests plugin to apply runtime type checking to collected tests.

Adds pytest-beartype-tests to dev dependencies (with a pinned git uv source) and cleans up related config (adds an empty [dependency-groups] dev entry and removes the obsolete Vulture ignore for pytest_collection_modifyitems).

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Empty dependency-groups section adds dead configuration

Low Severity

The newly added [dependency-groups] section with dev = [] is empty and serves no purpose. All dev dependencies live in optional-dependencies.dev, and CI uses uv run --extra=dev. This dead configuration could confuse contributors about where dev dependencies are managed, especially since uv sync installs dependency-groups.dev by default — which here resolves to nothing.

 

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