Revert "feat(abut): 흉벽 배면 헌치를 삽도 A-A대로 추가 (날개벽 내측면)"

This reverts commit aaa9f57908.

tests/abut-blocks-slab.test.ts

@@ -96,13 +96,4 @@ describe('교대 3D: 받침블럭과 접속슬래브 (spec §4.2, §4.8)', () =>
       if (pos.getZ(i) >= members.shape.wallBackM) expect(pos.getY(i)).toBeGreaterThanOrEqual(backTop(pos.getX(i)) - 1e-6);
     }
   });
-
-  it('the 흉벽 배면 헌치 sits on the 브라켓 상면 against the 흉벽 back, not in it', () => {
-    const backTop = (s: number) => members.parapetTopStartEl + ((members.parapetTopEndEl - members.parapetTopStartEl) * s) / model.length - members.shape.bracketHeightM;
-    for (const h of (named('haunches') as THREE.Group).children) {
-      const b = new THREE.Box3().setFromObject(h);
-      if (b.max.z > members.shape.parapetBackM + 1e-6 || b.min.z < members.shape.wallBackM - 1e-6) continue; // not the 흉벽 배면 헌치
-      expect(b.min.y).toBeGreaterThanOrEqual(Math.max(backTop(b.min.x), backTop(b.max.x)) - 1e-6);
-    }
-  });
 });

tests/abut-scene.test.ts

@@ -21,13 +21,13 @@ const group = buildAbutGroup(model, members, wings);
 const count = (name: string) => (group.getObjectByName(name) as THREE.Group | undefined)?.children.length ?? 0;
 
 describe('교대 A1 3D 장면 (AA3·AA3b·AA3c)', () => {
-  it('has the members: 5 wall blocks, 10 parapet parts (2 per step), 1 footing, 18 piles, 2 wings, 4 haunches (흉벽 배면 + 저판 상면)', () => {
+  it('has the members: 5 wall blocks, 10 parapet parts (2 per step), 1 footing, 18 piles, 2 wings, 2 haunches (저판 상면)', () => {
     expect(count('wall')).toBe(5); // one 벽체 block per 교좌면 step (삽도)
     expect(count('parapet')).toBe(10); // per step: back strip (흉벽 배면 단차) and the 흉벽 (삽도)
     expect(count('footing')).toBe(1);
     expect(count('piles')).toBe(18);
     expect(count('wings')).toBe(4); // upper and lower part per wing
-    expect(count('haunches')).toBe(4); // per wing: the 흉벽 배면 헌치 (삽도 A-A) and the 저판 상면 헌치
+    expect(count('haunches')).toBe(2); // per wing: the 저판 상면 헌치
   });
 
   it('spans from the pile tip (19.295 m) up to the highest parapet end (47.18 m)', () => {