feat(abut): 벽체 높이 H_w = 받침 ① 교좌면 ~ 흉벽 상단 연직 (기본 3326)

- 사용자 도면(2026-11-04): 받침 ① 위치에서 받침 ① 교좌면부터 흉벽 상단까지 연직 거리. 모든 교대 기본값 3326 (QA-4 가정 2500 대체)
- 입력 이름 "벽체 높이 · 받침 ① 기준 연직", ② 정면도에 받침 ① 기준선과 H_w 치수
- ③ 흉벽 철근표 대표 단면 = 받침 ① 위치 (P1–P3는 그 단면에서 정확히 계산)
- 테스트: 흉벽 상단 IP1 48.006 / IP3 47.661 등 + 0.826 반영, 교대흉벽철근.md §11 재현은 2500을 넣어 유지, 3326 기본 확인 (P1 3945)

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

verify/dump/abut-bearing1-heights.dump.ts

@@ -0,0 +1,29 @@
+// 교대 A1 받침 ① 위치의 높이 후보들 (흉벽 상단 · 교좌면 · 받침 z · 저판 상면 · 기초 하단)을 JSON으로 저장한다.
+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';
+
+it('dump 받침 ① 높이 후보', () => {
+  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 m = buildMembers(model, { bottomEl: rec.foundationBottomEl, pileLengthMm: rec.pileLengthMm });
+  const b1 = model.bearings[0];
+  const L = model.length;
+  const topAt = (s: number) => m.parapetTopStartEl + ((m.parapetTopEndEl - m.parapetTopStartEl) * s) / L;
+  const r = {
+    L, bearings: model.bearings.map((b) => ({ no: b.no, s: b.s, z: b.z, seatEl: b.seatEl, block: b.blockHeightMm })),
+    b1s: b1.s, top_b1: topAt(b1.s), seat_b1: b1.seatEl, z_b1: b1.z,
+    footingTop: m.footingTopEl, footingBottom: m.footingBottomEl,
+    parapetHeight: m.shape.parapetHeightM, bracketH: m.shape.bracketHeightM,
+    top_minus_seat: topAt(b1.s) - b1.seatEl, top_minus_z: topAt(b1.s) - b1.z, top_minus_footingTop: topAt(b1.s) - m.footingTopEl,
+    seat_minus_footingTop: b1.seatEl - m.footingTopEl, top_minus_footingBottom: topAt(b1.s) - (m.footingBottomEl ?? NaN),
+  };
+  writeFileSync(out + '/bearing1.json', JSON.stringify(r, null, 1));
+});

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

@@ -31,7 +31,7 @@ it('dump 교대 A1 흉벽 삽도', () => {
   const tM = ((wg.xb + members.shape.parapetBackM * 1000) / 2) / 1000;
   const span = slabSpanAt(abutPlanOutline(model, members, wings, slab).slab, tM, abutSkewK(model))!;
   const ch = (sEnd: number) => (wings.find((w) => w.sEnd === sEnd)?.haunchM ?? 0) * 1000;
-  const g = abutParapetGeom(wg, members.shape, { B: model.wing!.slabWidthMm, a: span.a, b: span.b, nearT: members.shape.parapetBackM * 1000 - slab.parapetGapMm, chamferA: ch(0), chamferB: ch(model.length) });
+  const g = abutParapetGeom(wg, members.shape, model.bearings[0].s, { B: model.wing!.slabWidthMm, a: span.a, b: span.b, nearT: members.shape.parapetBackM * 1000 - slab.parapetGapMm, chamferA: ch(0), chamferB: ch(model.length) });
   const r = abutParapetRebar(g, wall);
   const ns = (svg: string) => svg.replace('<svg ', '<svg xmlns="http://www.w3.org/2000/svg" ');
   writeFileSync(`${out}/parapet-section.svg`, ns(abutParapetSectionSvg(g, r)));