Root synthesis complete. Rebuilt the physics engine (green_reading.py) with all three key formulas (β=θ·sin(α), Δy=½·k·β·t_h², aim=−Δy) and created a comprehensive interactive HTML animation covering all 10 scenes: title, break physics, ball-hole setup, plumb-bob technique, cross-slope formula, shaft reading, break computation, aim point, putt trajectory, and summary.