Migrate packaging to uv

[KRRT7]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

AI?

• AI was used to generate this PR

AI generated PRs may be accepted, but only if @willmcgugan has responded on an issue or discussion.

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate (see note about typos above).
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Migrates Rich's packaging and development dependency workflow from Poetry to uv.

Changes include:

• Replace Poetry metadata with PEP 621 project metadata in pyproject.toml.
• Use uv_build as the PEP 517 build backend.
• Replace poetry.lock with uv.lock.
• Move dev, lint, test, and docs requirements into dependency groups.
• Update GitHub Actions, tox, Makefile, Read the Docs, and contributing docs to use uv project workflows.
• Remove docs/requirements.txt and the setup.py metadata shim.

Validation run locally:

• uv lock --check
• uv build --out-dir /private/tmp/rich-uvbuild-dist
• make docs
• Checked the built wheel includes rich/py.typed and the license file.

No linked issue/discussion yet; this is packaging maintenance.

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Additional details and impacted files

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Flag	Coverage Δ
unittests	97.81% <ø> (?)

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