Add auto dev → release PR workflow

.github/workflows/auto-release-pr.yml

@@ -0,0 +1,37 @@
+name: Auto release PR
+
+on:
+  push:
+    branches: [dev]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  open-release-pr:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Check for existing PR
+        id: check
+        run: |
+          pr=$(gh pr list --base release --head dev --state open --json number --jq '.[0].number')
+          echo "existing_pr=$pr" >> "$GITHUB_OUTPUT"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create PR if none exists
+        if: steps.check.outputs.existing_pr == ''
+        run: |
+          gh pr create \
+            --base release \
+            --head dev \
+            --title "Release: merge dev into release" \
+            --body "Automated PR to merge dev changes into release."
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}