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Decimal Fixed-Point Calculator

Decimal Fixed-Point Calculator: a task in termgrade-bandcentral-gemma4-31b-bash: TermGrade Band-Central: the 151-task selection and its splits (Harbor dataset). Implement a command-line tool /root/dfix that performs fixed-point decimal arithmetic with configurable precision and rounding.

The task

Implement a command-line tool `/root/dfix` that performs fixed-point decimal arithmetic with configurable precision and rounding.

Part of ai-and/termgrade-bandcentral-gemma4-31b-bash.