chore: Introduce pre-commit configuration and scripts

Co-authored-by: Shangjie Chen <deanchen@google.com>
PiperOrigin-RevId: 903957079

Author: DeanChensj

.github/workflows/pre-commit.yml

@@ -0,0 +1,39 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: pre-commit
+
+on:
+  push:
+    branches: [main, v2]
+    paths:
+      - '**.py'
+      - '.pre-commit-config.yaml'
+      - 'pyproject.toml'
+  pull_request:
+    branches: [main, v2]
+    paths:
+      - '**.py'
+      - '.pre-commit-config.yaml'
+      - 'pyproject.toml'
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v6
+
+      - name: Run pre-commit checks
+        uses: pre-commit/action@v3.0.1

pyproject.toml

@@ -90,6 +90,7 @@ dev = [
   "flit>=3.10.0",
   "isort>=6.0.0",
   "mypy>=1.15.0",
+  "pre-commit>=4.0.0",
   "pyink>=25.12.0",
   "pylint>=2.6.0",
   # go/keep-sorted end