[no-ci] Add auto-labeling workflow for PRs based on changed paths

.github/labeler.yml

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+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# Configuration for https://github.com/actions/labeler
+# Auto-applies labels based on which files a PR changes.
+
+cuda.bindings:
+  - changed-files:
+    - any-glob-to-any-file: 'cuda_bindings/**'
+
+cuda.core:
+  - changed-files:
+    - any-glob-to-any-file: 'cuda_core/**'
+
+cuda.pathfinder:
+  - changed-files:
+    - any-glob-to-any-file: 'cuda_pathfinder/**'
+
+CI/CD:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '.github/**'
+      - 'ci/**'

.github/workflows/pr-auto-label.yml

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+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: "CI: Auto-label PRs by path"
+
+on:
+  pull_request_target:
+    types:
+      - opened
+      - synchronize
+
+jobs:
+  auto-label:
+    name: Auto-label by changed paths
+    if: github.repository_owner == 'NVIDIA'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Apply labels
+        uses: actions/labeler@634933edcd8ababfe52f92936142cc22ac488b1b  # v6.0.1