What constitutes a valid completion of a community route challenge on Zwift, and are there any specific requirements or restrictions that must be met in order to have a ride count towards the challenge, such as minimum or maximum power output, required cadence, or specific bike and wheel combinations? How are route completions verified and tracked, and what measures are in place to prevent cheating or exploitation of the system? Are there any differences in how route challenges are handled between Zwifts various platforms, such as iOS, Android, and desktop, and are there any known issues or bugs that can affect a riders ability to complete a challenge?