Add explicit Python 3.13 setup to quality workflow

[Copilot]

The quality workflow relied on uv's implicit Python version management, which could lead to inconsistent CI behavior if the environment defaults differed from the project's Python 3.13 requirement.

Changes

• Added actions/setup-python@v5 step to explicitly configure Python 3.13 before uv installation
• Ensures CI environment matches requires-python = ">=3.13,<3.14" constraint in pyproject.toml

steps:
  - uses: actions/checkout@v6

  - name: Set up Python 3.13
    uses: actions/setup-python@v5
    with:
      python-version: "3.13"

  - name: Install uv
    uses: astral-sh/setup-uv@v7

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