vault_events::ExpiryPnlRealized: the change in the pool's gross realized result on one expiry
since that expiry's previous emission, emitted with every ExpiryPnl. An expiry's first
emission (its first settled sweep) carries the lifetime result, which can be a loss. A later
one carries the extra cash a later sweep returned, always a profit. Gross: before the
protocol/LP split, and including the sponsor fee subsidies mints moved into expiry cash.
vault_events::ExpiryPnlRealized: the change in the pool's gross realized result on one expiry since that expiry's previous emission, emitted with everyExpiryPnl. An expiry's first emission (its first settled sweep) carries the lifetime result, which can be a loss. A later one carries the extra cash a later sweep returned, always a profit. Gross: before the protocol/LP split, and including the sponsor fee subsidies mints moved into expiry cash.