Agent assignment failures (due to missing or invalid GH_AW_AGENT_TOKEN) were silently failing without being reported in the failure tracking issue. This made it difficult to diagnose why assignments weren't happening.

Changes

• Capture assignment errors: assign_to_agent.cjs now exports assignment_errors and assignment_error_count outputs containing failure details
• Expose through workflow: Compiler adds these outputs to the safe_outputs job in generated workflows
• Pass to conclusion job: notify_comment.go supplies assignment error data as environment variables
• Report in failure issues: handle_agent_failure.cjs processes assignment errors even when agent job succeeds, formatting them in failure issues/comments

Result

Failure issues now display assignment errors with issue numbers and error messages:

⚠️ Agent Assignment Failed: Failed to assign agent to issues due to insufficient permissions or missing token.

Assignment Errors:
- Issue #11198 (agent: copilot): Failed to assign copilot via GraphQL
- Issue #11136 (agent: copilot): Insufficient permissions

Error format: {type}:{number}:{agent}:{error_message} where type is "issue" or "pr".

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.