In the certification process you have to claim for a flight envelope (in our case wind envelope) and you have to demonstrate the maneuverability (pedal margin) in that wind envelope. If your tail rotor is limited, it will make a limitation on your hover performance and it will be clearly visible.
If your TR is limited and you are unable to maintain the critical heading, you will stabilize at the heading corresponding to your pedal stop but in no case you will start spinning.
Yawing right with full left pedal is nonsense. It could happen in pure hover without wind if you exceeded the MR torque that you are able to counterbalance with the full TR thrust. Certification does not allow that. The TR thrust is designed to cope with at least 17 kt in the critical azimuth and hover performance is limited to that point. You have little pedal margin at maximum hover performance in the critical azimuth but you recover a lot when the wind comes from a different direction.