Deterministic fixed-income & loan analytics. Bond mode: solve price<->yield-to-maturity, current yield, Macaulay & modified duration, and convexity from the bond's terms. Loan mode (send principal + annualRate + termMonths): level-payment amortization with monthly payment, total interest/paid, and the full schedule. Pure math from caller-supplied terms — no market-data feed, no fabrication.

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