Fix signed integer comparison operations performing unsigned comparisons

[Copilot]

CodeQL flagged integer conversion in signed comparison operations. Investigation revealed ICMP_SLT, ICMP_SGT, and ICMP_SGE were performing unsigned comparisons on uint32 values instead of signed comparisons, causing incorrect results for values ≥ 2^31.

Example of the bug:

// Before: unsigned comparison
src1Val := uint32(0xFFFFFFFF)  // -1 in two's complement
src2Val := uint32(0)
if src1Val > src2Val {  // evaluates to true (4294967295 > 0)
    // Wrong: -1 should not be greater than 0
}

// After: signed comparison
src1Signed := int32(src1Val)  // -1
src2Signed := int32(src2Val)  // 0
if src1Signed > src2Signed {  // evaluates to false (-1 > 0)
    // Correct
}

Changes

• runLTExport, runGTExport: Added int32 conversion for signed comparison semantics
• runSGEExport: Standardized comment for consistency
• Dead code removal: Deleted unused runSgtExport function
• Test coverage: Added unit tests verifying signed comparison behavior with negative values (0xFFFFFFFF, 0xFFFFFFFE)

CodeQL alert resolved (0 alerts after changes).

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