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

This reverts commit aaa9f57908.

src/view/abut-scene.ts

@@ -284,20 +284,6 @@ export function buildAbutGroup(
     const lower = prism(clipBelowX(below, members.shape.wallBackM / dir.wt), WING_THICKNESS_M, new THREE.Vector3(sEnd, 0, 0), ax, ey, new THREE.Vector3(a, 0, 0));
     add('wings', upper, 0xc9a77c);
     add('wings', lower, 0xc9a77c);
-    // 흉벽 배면 헌치 (삽도 A-A, 2026-11-03): a right triangle in the plane t–EL where the 흉벽 배면 (t −0.5) meets the 브라켓 상면.
-    // Legs 0.3 m: up the 흉벽 배면 and back along the 브라켓 상면 to the 벽체 배면 (t −0.8). Extruded 0.3 m from the 날개벽 내측면 toward the centre.
-    const sInner = sEnd + a * WING_THICKNESS_M + (dir.ws / dir.wt) * members.shape.parapetBackM;
-    const bracketHigh = Math.max(
-      members.parapetTopStartEl + ((members.parapetTopEndEl - members.parapetTopStartEl) * sInner) / L - members.shape.bracketHeightM,
-      members.parapetTopStartEl + ((members.parapetTopEndEl - members.parapetTopStartEl) * (sInner + a * HAUNCH_LEG_M)) / L - members.shape.bracketHeightM,
-    );
-    const ledge: [number, number][] = [
-      [members.shape.parapetBackM, bracketHigh],
-      [members.shape.parapetBackM, bracketHigh + HAUNCH_LEG_M],
-      [members.shape.wallBackM, bracketHigh],
-    ];
-    add('haunches', prism(ledge, HAUNCH_LEG_M, new THREE.Vector3(sInner, 0, 0), ez, ey, new THREE.Vector3(a, 0, 0)), 0xc9a77c);
-
     // 저판 상면 헌치 (수평, 2026-11-03): a right triangle in the plane EL–s on the 저판 상면, next to the 날개벽 내측면,
     // extruded along the wing from the 벽체 배면 to the 뒷굽.
     if (wing.footingHaunch) {