Add initial `math::u128` functions for core/math runtime.#2438

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otrho/stdlib-u128

Commits on Jan 21, 2026

Add initial `math::u128` functions for lib/core/math runtime.

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Fix function signatures for u128 procs.

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refactor(stdlib): adapt u128 arithmetic to new LE stack convention
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test(stdlib): add edge case tests for u128 arithmetic
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fix(stdlib): compute overflow products in u128 overflowing_mul
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refactor(tests): remove redundant wrapping_add computation in edge case test
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fix(stdlib): rename widening mul/madd opcodes in u128 arithmetic
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