Add engine configuration URL to token failure messages

[Copilot]

Agent failure messages now include a direct link to engine configuration documentation when secret verification fails.

Changes

Updated actions/setup/js/handle_agent_failure.cjs to append documentation URL to secret verification failure messages in both issue creation and comment flows:

secret_verification_context:
  secretVerificationResult === "failed"
    ? "\n**⚠️ Secret Verification Failed**: The workflow's secret validation step failed. Please check that the required secrets are configured in your repository settings.\n\nFor more information on configuring tokens, see: https://github.github.io/gh-aw/reference/engines/\n"
    : "",

Users encountering token configuration issues will now see the engines documentation URL directly in failure tracking issues and comments.

Original prompt

The message reported in the issue/comment on agent failure when the tokens are missing should contain a url to https://github.github.io/gh-aw/reference/engines/ which provides information on configuring the tokens.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[Copilot]

Pull request overview

This pull request enhances the error messaging for secret verification failures by adding a direct link to the engine configuration documentation.

Changes:

• Updated secret verification failure messages to include a documentation URL (https://github.github.io/gh-aw/reference/engines/) that helps users configure their tokens correctly

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.