Add shared python-lint composite action using uvx ruff

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

python-lint/action.yml

@@ -0,0 +1,38 @@
+# Python Lint
+# Runs ruff check via uvx (no pip install needed)
+# Bootstraps uv if not already available on the runner
+
+name: Python Lint
+description: Run ruff check on Python source code using uvx
+
+inputs:
+  src:
+    description: Source directory or file to check
+    default: '.'
+  ruff-version:
+    description: Ruff version to use (e.g., 0.9.x)
+    default: ''
+  extra-args:
+    description: Additional arguments to pass to ruff check
+    default: ''
+
+runs:
+  using: composite
+  steps:
+    - name: Ensure uv is available
+      shell: bash
+      run: |
+        if ! command -v uv &>/dev/null; then
+          echo "uv not found, installing..."
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+        fi
+
+    - name: Run ruff check
+      shell: bash
+      run: |
+        RUFF_SPEC="ruff"
+        if [ -n "${{ inputs.ruff-version }}" ]; then
+          RUFF_SPEC="ruff@${{ inputs.ruff-version }}"
+        fi
+        uvx $RUFF_SPEC check ${{ inputs.extra-args }} ${{ inputs.src }}