Extract duplicated CI setup steps into composite action

[Copilot]

Addresses feedback on PR #1 to eliminate code duplication across CI jobs by extracting common setup steps into a reusable composite action.

Changes:

• Created .github/actions/setup-python-uv/action.yml composite action that handles:
  • Repository checkout
  • uv installation and Python setup
  • Dependency installation with optional install-extras parameter
• Updated all three CI jobs (lint, type-check, test) to use the composite action
• Test job passes install-extras: true to install all extras

Before:

lint:
  runs-on: ubuntu-latest
  steps:
    - uses: actions/checkout@v4
    - name: Install uv
      uses: astral-sh/setup-uv@v4
      with:
        version: "latest"
    - name: Set up Python
      run: uv python install 3.12
    - name: Install dependencies
      run: uv sync --group dev
    - name: Run Ruff check
      run: uv run ruff check src/ tests/

After:

lint:
  runs-on: ubuntu-latest
  steps:
    - name: Setup Python with uv
      uses: ./.github/actions/setup-python-uv
    - name: Run Ruff check
      run: uv run ruff check src/ tests/

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[Copilot]

Pull request overview

This PR successfully refactors the CI workflow by extracting duplicated setup steps into a reusable composite action, reducing code duplication and improving maintainability.

Key Changes:

• Created a composite action that consolidates repository checkout, uv installation, Python setup, and dependency installation
• Updated all three CI jobs (lint, type-check, test) to use the new composite action
• Added configurable install-extras parameter to support different dependency installation requirements

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/actions/setup-python-uv/action.yml	New composite action that handles Python/uv setup with optional extras installation
.github/workflows/ci.yml	Simplified all three CI jobs by replacing duplicated setup steps with the composite action

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