Resolve PR from current branch in agent failure messages

[Copilot]

Agent failure messages displayed the workflow source path (which is often empty or unhelpful) instead of linking to the associated pull request.

Changes

Enhanced failure detection

• Added findPullRequestForCurrentBranch() to resolve PR via GitHub search API using current branch name
• Conditionally includes PR link in failure issue body when found

Simplified template

• Removed empty "Source" field from agent_failure_issue.md
• Added pull_request_info placeholder that renders as - **Pull Request:** [#99](url) when PR exists

Test coverage

• Updated all tests to mock the new PR search call
• Added tests for PR found/not found scenarios

Example output

When a PR exists:

## Failed Run

- **Workflow:** [Test Workflow](url)
- **Failed Run:** https://github.com/owner/repo/actions/runs/123
- **Pull Request:** [#99](https://github.com/owner/repo/pull/99)

When no PR exists, the PR line is omitted entirely.

Original prompt

The JavaScript code that generates the "agentic workflow failed" message should also try to resolve the pull request from the current branch and add it to the message template.
The "source" field is empty, remove from template.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[pelikhan]

@copilot conclusion need pull request read permissions too

[Copilot]

@copilot conclusion need pull request read permissions too

The conclusion job already has pull-requests: write permission (set at line 339 in pkg/workflow/notify_comment.go via NewPermissionsContentsReadIssuesWritePRWriteDiscussionsWrite()), which includes read access needed for the PR search functionality in handle_agent_failure.cjs.

[github-actions]

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[github-actions]

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[github-actions]

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[github-actions]

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[github-actions]

Smoke Test Results

Last 2 merged PRs:

• Add core.info logging to MCP gateway log parser #9645: Add core.info logging to MCP gateway log parser
• Fix capitalization and TOC structure in campaign docs #9642: Fix capitalization and TOC structure in campaign docs

Test Results:

• ✅ GitHub MCP: List PRs successful
• ✅ Playwright: Navigate to github.com, title verified
• ✅ File Writing: Created test file successfully
• ✅ Bash: Read file back successfully
• ✅ Go tool: go version returned 1.25.0

Overall Status: PASS

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