feat(abut-rebar): 교대 벽체 배근 삽도 (교대축 직각 단면 · 계단 단면)

- 배근 규칙 경로로 그림: 구간 1 단면 (W1–W7 · W9 · W10, 단 치수), 계단 단면 (W1 · W5 · W9 · W10 · W11 · W8, 구간 높이)
- 번호 풍선 · 선택 강조 · 선택만 보기는 저판 삽도와 같은 함수 (공용으로 export)
- verify/dump: 삽도 SVG 덤프 전용 설정 (기본 테스트에 포함 안 됨)

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

verify/dump/abut-wall-svg.dump.ts

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+// 교대 A1 벽체 배근 삽도 2장을 SVG로 저장한다 (PNG 확인: python3 -I ../verify/svg_to_png.py <svg> <png>).
+import { mkdirSync, readFileSync, writeFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import * as XLSX from 'xlsx';
+import { it } from 'vitest';
+import { buildAbut } from '../../src/core/abut/geometry';
+import { parseAbutments, toAbutInput } from '../../src/core/abut/parse';
+import { buildMembers } from '../../src/core/abut/members';
+import { abutFootingGeom, abutFootingRebar } from '../../src/core/abut/rebar/footing';
+import { skewAngle } from '../../src/core/abut/rebar/skew-layout';
+import { abutWallGeom, abutWallRebar } from '../../src/core/abut/rebar/wall';
+import { abutWallElevationSvg, abutWallSectionSvg } from '../../src/view/abut-wall-rebar-svg';
+
+it('dump 교대 A1 벽체 삽도', () => {
+  const out = process.env.DUMP_OUT ?? fileURLToPath(new URL('./out', import.meta.url));
+  mkdirSync(out, { recursive: true });
+  const xlsx = fileURLToPath(new URL('../../../../RAG/운곡교P1입력.xlsx', import.meta.url));
+  const rec = parseAbutments(XLSX.read(readFileSync(xlsx), { type: 'buffer' })).abutments[0];
+  const model = buildAbut(toAbutInput(rec));
+  const members = buildMembers(model, { bottomEl: rec.foundationBottomEl, pileLengthMm: rec.pileLengthMm });
+  const angle = skewAngle(rec.skewDeg);
+  const footing = abutFootingRebar(abutFootingGeom(model.length, members.shape, angle));
+  const g = abutWallGeom(model.length, members, angle);
+  const r = abutWallRebar(g, footing);
+  const ns = (svg: string) => svg.replace('<svg ', '<svg xmlns="http://www.w3.org/2000/svg" ');
+  writeFileSync(`${out}/wall-section.svg`, ns(abutWallSectionSvg(g, r)));
+  writeFileSync(`${out}/wall-elevation.svg`, ns(abutWallElevationSvg(g, r)));
+});

verify/vitest.dump.config.mjs

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+// 삽도 덤프 전용 설정: verify/dump/*.dump.ts만 실행한다 (기본 테스트에는 포함되지 않음).
+// 사용: npx vitest run --config verify/vitest.dump.config.mjs  (출력 폴더는 DUMP_OUT, 기본 verify/dump/out)
+export default { test: { include: ['verify/dump/**/*.dump.ts'] } };