Add pre-commit CI check verifying that all files have valid license annotations

.github/workflows/test.yml

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+# SPDX-FileCopyrightText: 2026 The P4 Language Consortium
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: Test
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  verify-licenses:
+    runs-on: ubuntu-latest
+    name: Validate that all files have copyright and license info
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install dev dependencies
+        run: |
+          ./CI/install-uv.sh
+      - name: Validate presence of copyright and license info (python w/reuse)
+        run: |
+          uvx reuse lint

CI/install-uv.sh

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+#!/usr/bin/env bash
+# SPDX-FileCopyrightText: 2026 The P4 Language Consortium
+# SPDX-License-Identifier: Apache-2.0
+
+set -eu
+
+UV_VERSION="${UV_VERSION:-0.11.7}"
+UV_INSTALL_DIR="${HOME}/.local/bin"
+
+if command -v uv >/dev/null 2>&1; then
+    exit 0
+fi
+
+mkdir -p "${UV_INSTALL_DIR}"
+
+if command -v curl >/dev/null 2>&1; then
+    env UV_UNMANAGED_INSTALL="${UV_INSTALL_DIR}" \
+        sh -c "$(curl -LsSf https://astral.sh/uv/${UV_VERSION}/install.sh)"
+elif command -v wget >/dev/null 2>&1; then
+    env UV_UNMANAGED_INSTALL="${UV_INSTALL_DIR}" \
+        sh -c "$(wget -qO- https://astral.sh/uv/${UV_VERSION}/install.sh)"
+else
+    echo "Neither curl nor wget is available to install uv" >&2
+    exit 1
+fi
+
+export PATH="${UV_INSTALL_DIR}:${PATH}"
+if [ -n "${GITHUB_PATH:-}" ]; then
+    echo "${UV_INSTALL_DIR}" >> "${GITHUB_PATH}"
+fi