Open-source ride-simulation extension for Hammerhead Karoo cycling computers. Replays a recorded FIT file as mock GPS plus virtual sensor data — so other Karoo extensions run as if a real ride were happening, without leaving home. Why Karoo extension development needs ride data. There's no Hammerhead-provided way to test extensions against meaningful sensor + GPS input without an actual ride. karoo-ride-replay fills that gap by playing back a real recorded ride from FIT — GPS, power, heart rate, cadence, speed, altitude, all at the original timing — so any other extension (7Climb, KPower, Wattramp, anything else) sees the data as if you were on the bike.