Amity Alert — Restricted Zone Monitor
“If it swims in the box, we sound the bell.” — Harbor Watch
Challenge: Trigger an alert if any position lies inside the restricted rectangle.
Operations • Safety Perimeter
Task:
  1. Implement check_alert(positions, zone) returning 'ALERT' or 'SAFE'.
  2. positions is a list of (x,y). zone is (x1,y1,x2,y2) (inclusive bounds).
  3. Click Run Unit Tests. If all tests pass, you'll get the flag.