Redo issue assignment to copilot to match docs (#61123)

Author: steves

.github/workflows/link-check-internal.yml

@@ -154,13 +154,20 @@ jobs:
               tableRows,
             ].join('\n')
 
-            const issue = await github.rest.issues.create({
+            // Use the REST API with agent_assignment to properly trigger Copilot cloud agent.
+            // See: https://docs.github.com/en/copilot/how-tos/use-copilot-agents/cloud-agent/start-copilot-sessions#using-the-rest-api
+            const issue = await github.request('POST /repos/{owner}/{repo}/issues', {
               owner: 'github',
               repo: 'docs-content',
               title: '[Copilot Task] Fix top redirect links: ${{ matrix.version }}/${{ matrix.language }}',
               body,
               labels: ['broken link report'],
-              assignees: ['copilot'],
+              assignees: ['copilot-swe-agent[bot]'],
+              agent_assignment: {
+                target_repo: 'github/docs-internal',
+                base_branch: 'main',
+                custom_instructions: 'For each entry in the table, open the source file in the github/docs-internal repository and replace the Current Link with the Update To path. When all changes are made, open a pull request in github/docs-internal with the fixes.',
+              },
             })
 
             core.info(`Created Copilot redirect issue: ${issue.data.html_url}`)