One entry in the hand-raise queue: who raised, and WHEN (so the queue preserves raise order and the perception feed can report how long each person has been waiting).
Optional
Their display name at raise time (for a human-readable queue in the perception feed).
The participant who raised their hand.
Epoch-ms when the hand was raised — drives queue ordering and wait-time reporting.
One entry in the hand-raise queue: who raised, and WHEN (so the queue preserves raise order and the perception feed can report how long each person has been waiting).