feat: add branch-cleanup workflow — auto-delete merged feature branches

Authored-by: Moko Consulting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.mokogitea/workflows/branch-cleanup.yml

@@ -0,0 +1,48 @@
+# Copyright (C) 2026 Moko Consulting <hello@mokoconsulting.tech>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# FILE INFORMATION
+# DEFGROUP: Gitea.Workflow
+# INGROUP: MokoStandards.Universal
+# REPO: https://git.mokoconsulting.tech/MokoConsulting/moko-platform
+# PATH: /.mokogitea/workflows/branch-cleanup.yml
+# VERSION: 01.00.00
+# BRIEF: Delete feature branches after PR merge
+
+name: "Branch Cleanup"
+
+on:
+  pull_request:
+    types: [closed]
+
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+
+jobs:
+  cleanup:
+    name: Delete merged branch
+    runs-on: ubuntu-latest
+    if: >-
+      github.event.pull_request.merged == true &&
+      github.event.pull_request.head.ref != 'dev' &&
+      github.event.pull_request.head.ref != 'main'
+
+    steps:
+      - name: Delete source branch
+        run: |
+          BRANCH="${{ github.event.pull_request.head.ref }}"
+          API="${{ vars.GITEA_URL || 'https://git.mokoconsulting.tech' }}/api/v1/repos/${{ github.repository }}/branches"
+          ENCODED=$(python3 -c "import urllib.parse; print(urllib.parse.quote('${BRANCH}', safe=''))")
+
+          STATUS=$(curl -sf -o /dev/null -w "%{http_code}" -X DELETE \
+            -H "Authorization: token ${{ secrets.GA_TOKEN }}" \
+            "${API}/${ENCODED}" 2>/dev/null || true)
+
+          if [ "$STATUS" = "204" ]; then
+            echo "Deleted branch: ${BRANCH}" >> $GITHUB_STEP_SUMMARY
+          elif [ "$STATUS" = "404" ]; then
+            echo "Branch already deleted: ${BRANCH}" >> $GITHUB_STEP_SUMMARY
+          else
+            echo "::warning::Failed to delete branch ${BRANCH} (HTTP ${STATUS})"
+          fi