netDebt + 200 gas reserve.
getBorrowingFee(debt), read on-chain (governable).
computeICR(collateral, entireDebt, price).
checkRecoveryMode(price), always surfaced.
Price at which the opened position would hit MCR.
netDebt >= minNetDebt(), the debt floor (C6).
In Recovery Mode an open must keep ICR >= CCR (150%); true in normal mode.
debt + fee, the value the minNetDebt floor is checked against (C6).
Result of MusdClient.previewOpen: fee, debt, ICR, liquidation price, and the floor/RM flags.