Reapply "fix(abut): 날개벽의 연직 헌치 삭제"

This reverts commit 4b51ef186f.

tests/abut-blocks-slab.test.ts

@@ -89,13 +89,8 @@ describe('교대 3D: 받침블럭과 접속슬래브 (spec §4.2, §4.8)', () =>
     for (const w of (named('wall') as THREE.Group).children) expect(new THREE.Box3().setFromObject(w).min.z).toBeGreaterThanOrEqual(members.shape.wallBackM - 1e-6);
   });
 
-  it('the upper 헌치 and the 접속슬래브 stay on the 브라켓 상면 over the back strip, not in it', () => {
+  it('the 접속슬래브 stays on the 브라켓 상면 over the back strip, 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) continue; // lower 헌치, behind the 벽체
-      expect(b.min.y).toBeGreaterThanOrEqual(Math.max(backTop(b.min.x), backTop(b.max.x)) - 1e-6);
-    }
     const pos = ((named('slab') as THREE.Group).children[0] as THREE.Mesh).geometry.getAttribute('position');
     for (let i = 0; i < pos.count; i++) {
       if (pos.getZ(i) >= members.shape.wallBackM) expect(pos.getY(i)).toBeGreaterThanOrEqual(backTop(pos.getX(i)) - 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, 6 haunches', () => {
+  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(6); // per wing: upper and lower 연직 헌치, 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)', () => {

tests/abut-wings.test.ts

@@ -117,15 +117,6 @@ describe('교대 날개벽 하단 선 · 헌치 (AA3c, spec_abut §4.7)', () =>
     expect(line[2].el).toBeCloseTo(45.214, 2);
   });
 
-  it('two vertical 300 × 300 haunches at the 내측면 corners: upper at the 흉벽 배면, lower at the 벽체 배면', () => {
-    expect(a2Left.haunches.map((h) => h.kind)).toEqual(['upper', 'lower']);
-    for (const h of a2Left.haunches) {
-      const [c0, c1, c2] = h.corners;
-      expect(Math.hypot(c1.e - c0.e, c1.n - c0.n)).toBeCloseTo(0.3, 6);
-      expect(Math.hypot(c2.e - c0.e, c2.n - c0.n)).toBeCloseTo(0.3, 6);
-    }
-  });
-
   it('the 저판 상면 haunch runs from the 벽체 배면 to the 뒷굽 on the 저판 상면; the 뒷굽 haunch is gone', () => {
     const f = a2Left.footingHaunch!;
     expect(f.el).toBeCloseTo(41.995, 3);
@@ -133,15 +124,6 @@ describe('교대 날개벽 하단 선 · 헌치 (AA3c, spec_abut §4.7)', () =>
     expect((a2Left as { heelHaunch?: unknown }).heelHaunch).toBeUndefined();
   });
 
-  it('upper haunch runs from the bracket top (흉벽 상단 − 0.85) to the wing top', () => {
-    const [up, low] = a2Left.haunches;
-    // The upper haunch rests on the highest point of the 브라켓 top over its footprint (the top falls along s), never below it.
-    expect(up.zBottomEl).toBeGreaterThanOrEqual(46.838 - 0.85 - 1e-6);
-    expect(up.zBottomEl).toBeLessThan(46.838 - 0.85 + 0.05);
-    expect(up.zTopEl).toBeGreaterThan(up.zBottomEl);
-    expect(low.zBottomEl).toBeCloseTo(41.995, 3);
-    expect(low.zTopEl).toBeCloseTo(46.838 - 0.85, 2);
-  });
 });
 
 describe('날개벽 수평 단 (QA-12 초안 적용, spec_abut §4.7)', () => {