ci: Automate releasing

.github/workflows/pr.yml

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+name: PR
+
+on:
+  pull_request:
+    types:
+      - edited
+      - opened
+      - synchronize
+
+jobs:
+  lint-pr-title:
+    name: Lint PR title
+    runs-on: ubuntu-latest
+    steps:
+      - name: Validate conventional commit format
+        uses: amannn/action-semantic-pull-request@v6
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          # Mirrors changelog-sections in release-please-config.json
+          types: |
+            feat
+            fix
+            infra
+            ci
+            docs
+            deps
+            perf
+            refactor
+            test
+            chore

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write # Create release commits and tags
+  pull-requests: write # Create and update release PRs
+
+jobs:
+  release-please:
+    name: Update release PR
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run release-please
+        uses: googleapis/release-please-action@v4
+        with:
+          token: ${{ secrets.RELEASE_PLEASE_GITHUB_TOKEN }}

.release-please-manifest.json

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+{
+  ".": "0.0.0"
+}

CHANGELOG.md

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+# Changelog

release-please-config.json

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+{
+  "bootstrap-sha": "3c86526",
+  "packages": {
+    ".": {
+      "release-type": "simple",
+      "changelog-path": "CHANGELOG.md",
+      "bump-minor-pre-major": false,
+      "bump-patch-for-minor-pre-major": false,
+      "draft": false,
+      "prerelease": false,
+      "include-component-in-tag": false
+    }
+  },
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "changelog-sections": [
+    {
+      "type": "feat",
+      "hidden": false,
+      "section": "Features"
+    },
+    {
+      "type": "fix",
+      "hidden": false,
+      "section": "Bug Fixes"
+    },
+    {
+      "type": "infra",
+      "hidden": false,
+      "section": "Infrastructure"
+    },
+    {
+      "type": "ci",
+      "hidden": false,
+      "section": "CI"
+    },
+    {
+      "type": "docs",
+      "hidden": false,
+      "section": "Docs"
+    },
+    {
+      "type": "deps",
+      "hidden": false,
+      "section": "Dependency Updates"
+    },
+    {
+      "type": "perf",
+      "hidden": false,
+      "section": "Performance Improvements"
+    },
+    {
+      "type": "refactor",
+      "hidden": false,
+      "section": "Refactoring"
+    },
+    {
+      "type": "test",
+      "hidden": false,
+      "section": "Tests"
+    },
+    {
+      "type": "chore",
+      "hidden": false,
+      "section": "Other"
+    }
+  ]
+}