[Junie]: Review PR diff and update README documentation

[junie-github-actions]

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• 🔗 Issue: Fixes: CI Failures agent #53

📊 Junie Summary:

Documentation Review Complete

Reviewed the PR marco_ci_failures and updated documentation to match code changes.

Changes Found in PR:

1. Internal refactoring: Changed from JSON_JUNIE_OUTPUT environment variable to JSON_JUNIE_OUTPUT_FILE (file-based output) - internal implementation detail, no user-facing impact
2. New feature: Automatic CI failure analysis on workflow_run events with failure conclusion
   • Added FIX_CI_ACTION constant and fix-ci trigger phrase
   • Added createFixCIFailuresPrompt() function for automatic prompt generation
   • Added isWorkflowRunFailureEvent() and isReviewOrCommentHasFixCITrigger() helper functions

Documentation Status:

✅ README.md - Already accurate:

• All inputs/outputs correctly documented (lines 123-222)
• CI Failure Analysis feature mentioned in features list (line 30)
• workflow_run mentioned in Security Considerations (line 360)
• No updates needed

✅ COOKBOOK.md - Updated:

• Recipe New prompt generation #3 "Fix Failing CI Tests" (lines 303-369) updated to reflect automatic behavior
• Removed lengthy custom prompt from example (now optional)
• Added note explaining automatic prompt generation on workflow_run failures
• Documented alternative triggers (fix-ci phrase in comments)
• Added optional custom prompt example for advanced users

Summary:

The PR adds automatic CI failure detection that simplifies the user experience. Documentation has been updated to reflect this improvement, making it clear that custom prompts are optional for workflow_run failure events.