docs: expand donate text with developer license context

.commitlintrc.json

@@ -0,0 +1,3 @@
+{
+  "extends": ["@commitlint/config-conventional"]
+}

.github/workflows/commitlint.yml

@@ -0,0 +1,27 @@
+name: Commitlint
+
+on:
+  pull_request:
+    branches:
+      - main
+      - development
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  lint:
+    name: Lint commit messages
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - name: Lint commits
+        uses: wagoid/commitlint-github-action@v6
+        with:
+          configFile: .commitlintrc.json

.github/workflows/release.yml

@@ -337,3 +337,15 @@ jobs:
 
           version="${{ steps.version.outputs.value }}"
           gh release create "${version}" "${{ steps.version.outputs.archive }}" --title "${version}" --notes-file "${{ steps.notes.outputs.file }}" --target "${GITHUB_SHA}"
+
+      - name: Back-merge main into development
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          version="${{ steps.version.outputs.value }}"
+          pr_url="$(gh pr list --head main --base development --state open --json url --jq '.[0].url')"
+          if [[ -z "${pr_url}" || "${pr_url}" == "null" ]]; then
+            pr_url="$(gh pr create --base development --head main --title "chore: sync main into development after ${version}" --body "Automated back-merge of \`main\` into \`development\` following the ${version} release.")"
+          fi
+          echo "Back-merge PR: ${pr_url}" >> "$GITHUB_STEP_SUMMARY"

README.md

@@ -19,7 +19,7 @@ This is a macOS screen saver based on the iconic rain of characters and symbols
    ```
 
 4. In the opened Wallpaper settings, switch to **Screen Saver** and select **MatrixScreenSaver**.
-5. Enjoy and donate<br>
+5. Enjoy and donate — so I can invest in a developer license for signing the screen saver and make it installable with a double-click (Thanks Apple 😐)<br>
    <a href="https://www.buymeacoffee.com/yesman82"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me a Coffee" width="150"></a><br>
    <img src="docs/bmc_qr.png" alt="Buy Me a Coffee QR code" width="150">