Install uv in lint workflow before uv commands

Author: Copilot

.github/workflows/lint.yaml

@@ -8,6 +8,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with: { python-version: "3.14" }
+      - uses: astral-sh/setup-uv@v5
       - run: uv sync
       - run: uv run ruff check .
       - run: uv run ruff format --check .