fix: handle division by zero#115
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Assisted-by: Claude:claude-sonnet-4-6
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Per EVM spec, DIV/MOD/SDIV/SMOD with a zero divisor must return 0. Previously
divmod256was called unconditionally, causing an infinite loop in the shift-and-subtract implementation.Changes
zero256check; skipdivmod256when divisor is zero (result slot already holds 0)test_div_zerocovering all six division/modulo opcodes (DIV, SDIV, MOD, SMOD, ADDMOD, MULMOD) with zero divisor/modulus