Add release automation and CHANGELOG

.github/workflows/release.yml

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+name: Release
+
+# Cut a release by pushing a tag like `v1.1.0` (must match manifest.json).
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: write # create the GitHub Release and upload assets
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+        with:
+          node-version: 24
+          cache: npm
+
+      - run: npm ci
+
+      - name: Verify tag matches manifest version
+        run: |
+          manifest_version="v$(node -p "require('./manifest.json').version")"
+          if [ "$manifest_version" != "$GITHUB_REF_NAME" ]; then
+            echo "Tag $GITHUB_REF_NAME does not match manifest version $manifest_version" >&2
+            exit 1
+          fi
+
+      - run: npm run build
+
+      - name: Create GitHub Release with build artifacts
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh release create "$GITHUB_REF_NAME" \
+            github-pr-reverse-comments.zip \
+            github-pr-reverse-comments-*.xpi \
+            --title "$GITHUB_REF_NAME" \
+            --generate-notes

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.1.0] - 2026-06-04
+
+### Added
+
+- Reverse the individual commits inside "added N commits" timeline batches on
+  the Conversation page, so a batch reads newest-commit-first.
+- A status-checks indicator at the top of the conversation that reflects the
+  overall check state (passing / failing / running) and scrolls to the checks
+  box when clicked.
+- Development tooling: ESLint, Prettier, Vitest with coverage gating, JSDoc
+  type-checking (`tsc --checkJs`), GitHub Actions CI, CodeQL scanning,
+  Dependabot, and a tag-triggered release workflow.
+- `LICENSE` file (MIT).
+
+### Changed
+
+- Refactored shared logic into `constants.js`, `reorder.js`, and `checks.js`
+  modules with a single source of truth for the storage key and order values.
+
+## [1.0.6] - 2026-05-19
+
+### Added
+
+- Reverse the Commits tab (both the day groups and the commits within each
+  day), including the modern React-rendered Commits page.
+- Firefox support (Manifest V3, signed `.xpi`).
+
+[Unreleased]: https://github.com/ShiosOS/github-pr-reverse-comments/compare/v1.1.0...HEAD
+[1.1.0]: https://github.com/ShiosOS/github-pr-reverse-comments/releases/tag/v1.1.0
+[1.0.6]: https://github.com/ShiosOS/github-pr-reverse-comments/releases/tag/v1.0.6