fix:track market debt in scaled units to clear repayment dust - #15
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Borrowers repaying their full debt (principal + interest) were left with 1-2 rao of unrepayable dust: total_debt was tracked in face units while positions store scaled debt, so borrow (nominal add), accrue_interest (floor of stale integer) and the repay/liquidate min(repay, total_debt) clamp drifted the market total below the sum of user debts; at total_debt == 0 every further repay clamped to zero and the position could never be cleared.
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Borrowers repaying their full debt (principal + interest) were left with 1-2 rao of unrepayable dust: total_debt was tracked in face units while positions store scaled debt, so borrow (nominal add), accrue_interest (floor of stale integer) and the repay/liquidate min(repay, total_debt) clamp drifted the market total below the sum of user debts; at total_debt == 0 every further repay clamped to zero and the position could never be cleared.