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6a8844e2fc
Add shared pow10_int() helper to helpers.h that computes 10^exp using iterative multiplication/division instead of powf. Replace powf(10, exp) calls in: - sensor/filter.cpp: ValueListFilter and RoundFilter - helpers.cpp: normalize_accuracy_decimals (refactored to use pow10_int for the general case, keeping -1/-2 fast paths) Eliminates powf/__ieee754_powf from builds where sensor filters are the only remaining powf call site.
