Symptom

Courses with level 1 (e.g., "Intro to Git & GitHub") always get a recommendation score of 0 using PopularityStrategy. Level 2 gets 10.

Expected: Level 1 should produce a base score of 10 (level * 10).

Context

The scoring system uses a Template Method pattern. The base class Strategy orchestrates the pipeline:

1. baseScore() -- subclass computes initial score
2. applyLevelWeight() -- multiplies by clamped level weight
3. applyDeadlinePenalty() -- urgency boost
4. applyInstructorAdjustment() -- self-paced bonus
5. finalAdjustments() -- subclass hook

PopularityStrategy only overrides baseScore(). Focus there.