Make CI Self-Starting and Observable

Add SCM polling, failure handling, and retained build output.

A intermediate Jenkins challenge worth 10 points. Solve it hands-on in a real Jenkins environment in your browser - no local setup, no fake shells.

The Challenge

Scenario: Engineers forget to click Build Now, failures disappear into logs, and build output is lost.

Requirements:

• Add pollSCM with a five-minute schedule
• Archive dist/** after successful builds
• Add a failure post condition that records a clear message
• Preserve the existing build and test stages