A rotation is a burst of one offer per peer (join/leave and the periodic
re-key), but the limiter was keyed per sender at 5/sec — in calls with 6+
participants the 6th+ peer's offer was silently rate-limited, that peer
never received the rotated key, and their audio never decrypted again.
Keying per (sender, target) admits any rotation burst regardless of
channel size while still capping repeated offers at a single victim,
which is the abuse the limit exists for (an offer can force the target to
re-key or disconnect).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
