The Game of Life update loop was spending unnecessary time on bounds-checked neighbor counts for interior cells, reducing simulation throughput.

• Grid update specialization: Separately process top/bottom rows with existing bounds-aware logic while handling interior rows via direct row pointers to eliminate per-cell bounds checks and Point construction overhead.
• Edge safeguards: Guard bottom-row processing for single-row grids to avoid duplicate work.

Example of the optimized inner loop:

const bool* rowAbove = current.grid_.data() + ((x - 1) * SIZE);
const bool* row      = current.grid_.data() + (x * SIZE);
const bool* rowBelow = current.grid_.data() + ((x + 1) * SIZE);

for (int y = 1; y < SIZE - 1; ++y) {
    const int live = rowAbove[y - 1] + rowAbove[y] + rowAbove[y + 1]
                   + row[y - 1]                   + row[y + 1]
                   + rowBelow[y - 1] + rowBelow[y] + rowBelow[y + 1];
    destRow[y] = gameOfLife(row[y], live);
}

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