Add commitlint configuration and compliance checks

.commitlintrc.json

@@ -0,0 +1,42 @@
+{
+  "extends": [
+    "@commitlint/config-conventional"
+  ],
+  "rules": {
+    "type-enum": [
+      2,
+      "always",
+      [
+        "build",
+        "chore",
+        "ci",
+        "cleanup",
+        "docs",
+        "doc",
+        "feat",
+        "fix",
+        "perf",
+        "refactor",
+        "revert",
+        "security",
+        "style",
+        "test"
+      ]
+    ],
+    "subject-case": [
+      2,
+      "always",
+      [
+        "sentence-case",
+        "start-case",
+        "pascal-case",
+        "upper-case"
+      ]
+    ],
+    "header-max-length": [
+      2,
+      "always",
+      120
+    ]
+  }
+}

.github/workflows/compliance.yaml

@@ -0,0 +1,25 @@
+# SPDX-FileCopyrightText: 2026 Institute for Automation of Complex Power Systems, RWTH Aachen University
+# SPDX-License-Identifier: Apache-2.0
+
+name: Compliance checks
+
+on:
+  pull_request:
+    branches: [master, main]
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  conventional-commits:
+    name: Conventional commit messages
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+        with:
+          fetch-depth: 0
+
+      - uses: wagoid/commitlint-github-action@v6
+        with:
+          configFile: .commitlintrc.json

.pre-commit-config.yaml

@@ -6,6 +6,10 @@ default_stages: [pre-commit]
 
 # See https://pre-commit.com for more information
 # See https://pre-commit.com/hooks.html for more hooks
+
+# commitlint runs at commit-msg, so plain `pre-commit install` must wire that stage too.
+default_install_hook_types: [pre-commit, commit-msg]
+
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v5.0.0
@@ -76,6 +80,13 @@ repos:
     hooks:
       - id: reuse-lint-file
 
+  - repo: https://github.com/alessandrojcm/commitlint-pre-commit-hook
+    rev: "v9.26.0"
+    hooks:
+      - id: commitlint
+        stages: [commit-msg]
+        additional_dependencies: ["@commitlint/config-conventional@19.8.1"]
+
   - repo: local
     hooks:
       - id: dco-hook

release-please-config.json

@@ -1,6 +1,7 @@
 {
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
   "release-type": "simple",
+  "pull-request-title-pattern": "chore${scope}: Release${component} ${version}",
   "packages": {
     ".": {
       "extra-files": [