Demo on the messier sibling of the exercise method: three unwanted
dependencies in one loop (Scorer incl. static field write, System.out,
clock — clock stripped in 2-min prep). Same six mechanics with SVGs in
the storyboard style, ends green via overload + pure-lambda approval
test. Pointer added to the learning hour's demo section.
Step-by-step refactoring instructions as a single markdown handout with
one diagram per step (legend + steps 0-3, overload inset, pure test,
debrief slides for the dead call and the drift anti-pattern). Derived
from the pattern draft, the learning hour plan, and the rehearsal
findings; slide-ready for later.
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