Pull Request Overview

This PR implements PEP 735 dependency groups, removes legacy requirement files, and updates CI/docs workflows to use pip’s --group installs.

Define tests, docs, and all dependency groups in pyproject.toml
Remove requirements-*.txt files and switch workflows from -r installs to --group flags
Reformat array syntax and lint settings in pyproject.toml for consistency

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File	Description
requirements-unit-tests.txt	Removed legacy test requirements file
requirements-dev-all.txt	Removed legacy dev-all requirements file
pyproject.toml	Added `[dependency-groups]`, collapsed arrays, updated optional-dependencies
docs/requirements-docs.txt	Removed legacy docs requirements file
.readthedocs.yml	Updated RTD install step—now only `pip install .`
.github/workflows/unit_tests.yml	Switched to `pip install . --group tests`, removed old installs
.github/workflows/test_official.yml	Switched to `pip install .[all] --group tests`
.github/workflows/docs-linkcheck.yml	Switched to `pip install .[all] --group all`
.github/workflows/docs-admonitions.yml	Switched to `pip install . --group all`
.github/workflows/chango.yml	Switched to `pip install . --group docs`
.github/CONTRIBUTING.rst	Updated contributor setup to use `--group all`

Comments suppressed due to low confidence (3)

.readthedocs.yml:20

The ReadTheDocs config no longer installs documentation dependencies. You should add an install argument to include the docs group (e.g., args: ["--group", "docs"]) so Sphinx requirements are pulled in.

    - method: pip
      path: .

.github/workflows/unit_tests.yml:41

[nitpick] The tests dependency group already includes pytest-xdist, so this extra installation is redundant and can be removed.

python -W ignore -m pip install pytest-xdist

.github/workflows/docs-admonitions.yml:34

With the old requirements files removed, the cache no longer tracks dependency changes. Consider adding cache-dependency-path: 'pyproject.toml' (or similar) to ensure the cache is invalidated when dependencies are updated.

-          cache-dependency-path: '**/requirements*.txt'

Merged

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