Full mock rounds

Each mock opens on an instructions page with its rules and a system check; the timer starts only when you press Start. Then it runs in interview mode: no hints, no protocol helper, a countdown, and an automatic submit at 0:00. Afterwards the debrief shows your Outcome and Process scores with a reason for each, your time to reproduce, a timeline of your round, what you missed and the reference solution. Repo mocks need a desktop.