Fee breakdown. referral is the slice of the trader-paid trading fee and
congestion surcharge delivered to the referrer; inventoryImpact is the
path-independent inventory-impact charge assessed on the mint.
Persist this: required to redeem/claim the position later.
Stable across partial-close replacements; equals orderId at mint.
Premium paid into LP backing, in quote units.
Max payout actually minted, in quote units (mintAmount: chain-floored).
0..1 range probability quoted at entry (your fill price per $1 payout).