feat(instrumenter): add FloorDivision mutator (#5642)#6087
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Implements bidirectional mutation between modulo and floor division: - Forward: `a % b` → `Math.floor(a / b)` - Reverse: `Math.floor(x / y)` or `Math.trunc(x / y)` → `x % y` Updates the benchmark-big.ts perf test expected mutant count from 933 to 942, reflecting 9 new mutants introduced by this mutator (+7 from `%` operators and +2 from `Math.floor(x / y)` calls in that fixture).
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Adds a
FloorDivisionmutator that swaps between modulo and floor division, as requested in #5642.a % b→Math.floor(a / b)Math.floor(a / b)→a % bMath.trunc(a / b)→a % bThe forward direction only emits
Math.floor, notMath.trunc— the two differ only for negative operands, so a second forward mutant would be near-redundant. The reverse direction accepts both so existingfloor/trunccode gets mutated either way.Closes #5642