docs(rebar): B9 행 엇갈림 방향을 L 방향으로 명시

삽도(9,350 기초)의 상면 200과 중앙 450 여유 차이 250 = 2s가 L 방향 엇갈림을 보여 줌. 계산은 그대로.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
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ypshimandClaude Haiku 5.5 committed 2026-10-27 12:35:11 +09:00
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@@ -212,6 +212,7 @@ export function b9Bars(L: number, W: number, columnX: number[], columnD: number
const halfBar = NOMINAL_DIAMETER.H16 / 2;
const bars: B9Bar[] = [];
const perRow = rowIndices.map((iW, r) => {
// Staggered by 2 steps along L between neighbouring rows (엇갈림 2s, L 방향; 삽도 상면 200 · 중앙 450).
const start = r % 2 === 0 ? 1 : 3;
let kept = 0;
for (let iL = start; iL < xs.length; iL += 4) {