feat(abut-rebar): ③ 교대 벽체 3D 철근 (W1–W11)

- 벽체 배근 경로를 저판 철근과 같은 교대 3D 철근에 추가 (buildAbutRebar3D). 선택 · 선택만 보기 · 색 기준 공통
- 테스트: 철근표 = 3D 개수, 모든 벽체 철근이 벽체 면 · 끝면 안, 저판 하면 철근망 위

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

src/main.ts

@@ -73,7 +73,7 @@ import { pileGeometry } from './core/geometry';
 import { rebarSummary, type RebarRow } from './core/rebar/summary';
 import { shearSegments } from './core/rebar/coping';
 import { buildRebar3D, type RebarColorMode, type RebarScene } from './view/rebar3d';
-import { buildAbutFootingRebar3D } from './view/abut-rebar3d';
+import { buildAbutRebar3D } from './view/abut-rebar3d';
 import { DEFAULT_MATERIAL, FCK_MEMBERS, fckChanged, fyOf, GRADE_CHOICES, IMPORTED_FCK, isAssumedMaterial, materialFor, materialFrom, type BendFactors, type FckByMember, type FckMember, type GradeKey, type Material } from './core/rebar/common';
 import { buildQuantity, quantityRows, type Quantity, type QuantityLine } from './core/rebar/quantity';
 import { groundElFor, parseGroundModel, strataRowsFor, type GroundMapLayer, type GroundModelFile } from './core/ground-model';
@@ -682,12 +682,13 @@ function setupScene(): void {
     state.scene = scene;
     setView(state.view);
   }
-  // ③ 교대 (2026-11-04): with the piers hidden, the selected abutment's 저판 rebar is the ③ rebar (표 · 3D 선택 공통).
+  // ③ 교대 (2026-11-04): with the piers hidden, the selected abutment's 저판 · 벽체 rebar is the ③ rebar (표 · 3D 선택 공통).
   const abutRec = piersShown(state.stage, state.abutActive) ? undefined : state.abutments.find((a) => a.name === state.abutActive);
   const abutGroup = abutRec ? abutGroupByName.get(abutRec.name) : undefined;
   const footing = abutRec ? abutFootingBuilt(abutRec) : null;
-  if (abutGroup && footing && footing.bottomEl !== undefined) {
-    rebar3d = buildAbutFootingRebar3D(footing.geom, footing.result, footing.skewK, footing.backM, footing.bottomEl);
+  if (abutRec && abutGroup && footing && footing.bottomEl !== undefined) {
+    const wall = abutWallBuilt(abutRec, footing.result);
+    rebar3d = buildAbutRebar3D(footing.geom, footing.result, footing.skewK, footing.backM, footing.bottomEl, wall?.result);
     rebar3d.group.applyMatrix4(abutGroup.matrix);
     rebar3d.group.visible = state.stage === 'rebar';
     rebar3d.setColorMode(state.rebarColor);