ci: use create-pull-request in writer agent workflow

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

Author: dvdksn

.github/workflows/agent-writer.yml

@@ -67,54 +67,32 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Check for changes
-        id: changes
-        run: |
-          if git diff --quiet; then
-            echo "has_changes=false" >> $GITHUB_OUTPUT
-          else
-            echo "has_changes=true" >> $GITHUB_OUTPUT
-          fi
-
-      - name: Commit and push
-        if: steps.changes.outputs.has_changes == 'true'
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          git config user.name "github-actions[bot]"
-          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
-
-          BRANCH="agent/issue-${{ github.event.issue.number }}"
-          git checkout -b "$BRANCH"
-          git add .
-          git commit -m "docs: address issue #${{ github.event.issue.number }}
-
-          This change was automatically generated by the documentation agent team
-          in response to issue #${{ github.event.issue.number }}.
-
-          🤖 Generated with cagent"
+      - name: Create pull request
+        id: create-pr
+        uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0
+        with:
+          branch: agent/issue-${{ github.event.issue.number }}
+          title: "docs: address issue #${{ github.event.issue.number }}"
+          body-path: .pr-body.md
+          commit-message: |
+            docs: address issue #${{ github.event.issue.number }}
 
-          git push origin "$BRANCH"
+            This change was automatically generated by the documentation agent team
+            in response to issue #${{ github.event.issue.number }}.
 
-      - name: Create pull request
-        if: steps.changes.outputs.has_changes == 'true'
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          gh pr create \
-            --title "docs: address issue #${{ github.event.issue.number }}" \
-            --body-file .pr-body.md \
-            --label agent/generated
+            🤖 Generated with cagent
+          labels: agent/generated
+          delete-branch: true
 
       - name: Comment on issue (success)
-        if: steps.changes.outputs.has_changes == 'true'
+        if: steps.create-pr.outputs.pull-request-number
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           gh issue comment ${{ github.event.issue.number }} --body "✅ The agent team has created a PR to address this issue. Please review when ready."
 
       - name: Comment on issue (no changes)
-        if: steps.changes.outputs.has_changes == 'false'
+        if: "!steps.create-pr.outputs.pull-request-number"
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |