The local safe_div lambda in oracle_sparsify already multiplied by 100.0 to produce a percentage, but the call site multiplied by 100.0 again—displaying cache usefulness as ~10000% instead of ~100%.

// Before: local lambda multiplies by 100, caller multiplies by 100 again
auto safe_div = [](uint32_t a, uint32_t b) {
    if (b == 0) return 0.0;
    return (double)a/(double)b*100.0;  // already a percentage
};
// ...
<< safe_div(...)*100.0 << "%"  // 100x too large

• Removed the redundant local safe_div lambda; now uses the global safe_div from constants.h (which returns a plain ratio), consistent with how oracle_vivif already does it

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