feat(abut): 벽체 배근 입력 저장 · 교대 벽체 등 fck(35)

- AbutRecord.rebar.wall (바꾼 값만), applyWallRebar, 프로젝트 파일 검증
- 교대 벽체 · 흉벽 · 날개벽 · 접속슬래브 fck(abutBody, 기본 35)를 ② 벽체·흉벽 카드에서 입력. 저판 fck 행과 같은 함수

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

src/core/abut/edit.ts

@@ -9,6 +9,7 @@ import { ABUT_SHAPE_DEFAULT, normalizeShape, shapeIssues, type AbutShape } from
 import { resolveSlab, slabIssues, type AbutSlab, type SlabForm } from './slab';
 import type { AbutGround } from './ground';
 import { footingRebarIssues, resolveFootingRebar, type AbutFootingRebarSettings } from './rebar/footing';
+import { resolveWallRebar, wallRebarIssues, type AbutWallRebarSettings } from './rebar/wall';
 import { abutBearingRuleIssues, resolveBearingRule, type AbutBearingRule } from './bearing-table';
 
 export type AbutEditKey = 'seatEl' | 'foundationBottomEl' | 'groundEl' | 'pileLengthMm' | 'skewDeg' | 'slopeI';
@@ -178,6 +179,16 @@ export function applyFootingRebar(rec: AbutRecord, patch: Partial<AbutFootingReb
   return { ...rec, rebar: { ...(rec.rebar ?? {}), footing } };
 }
 
+/** Changes ③ 벽체 배근 values (only the changed ones are kept; undefined clears one), refused with a Korean message. */
+export function applyWallRebar(rec: AbutRecord, patch: Partial<AbutWallRebarSettings>): AbutRecord {
+  for (const v of Object.values(patch)) if (typeof v === 'number' && !Number.isFinite(v)) throw new Error('숫자를 입력하세요.');
+  const wall: Partial<AbutWallRebarSettings> = { ...(rec.rebar?.wall ?? {}), ...patch };
+  for (const key of Object.keys(wall) as (keyof AbutWallRebarSettings)[]) if (wall[key] === undefined) delete wall[key];
+  const issues = wallRebarIssues(resolveWallRebar(wall));
+  if (issues.length > 0) throw new Error(issues[0]);
+  return { ...rec, rebar: { ...(rec.rebar ?? {}), wall } };
+}
+
 /** Changes one 접속슬래브 dim, refused with a Korean message when the slab would not build. */
 export function applySlabEdit(rec: AbutRecord, key: (typeof SLAB_EDIT_FIELDS)[number]['key'], value: number): AbutRecord {
   if (!Number.isFinite(value)) throw new Error('숫자를 입력하세요.');

src/core/abut/parse.ts

@@ -16,6 +16,7 @@ import type { WingDims } from './wings';
 import type { AbutSlab } from './slab';
 import type { AbutGround } from './ground';
 import type { AbutFootingRebarSettings } from './rebar/footing';
+import type { AbutWallRebarSettings } from './rebar/wall';
 
 type Cell = string | number | null | undefined;
 type Grid = Cell[][];
@@ -67,7 +68,7 @@ export interface AbutRecord {
   /** 지반·지층 입력 (② 지반·지층 카드, 교각과 같은 필드). Absent = 육상, 지하수위 없음, 지층 행 없음. */
   ground?: AbutGround;
   /** ③ 배근 입력 (부재별, 바꾼 값만). Absent = 엑셀 Abut 시트 기본값. */
-  rebar?: { footing?: Partial<AbutFootingRebarSettings> };
+  rebar?: { footing?: Partial<AbutFootingRebarSettings>; wall?: Partial<AbutWallRebarSettings> };
   /** 예전 "좌우 같게" 값 (2026-11-04 이전 파일). 지금은 읽기만 하고 쓰지 않는다. */
   wingsLinked?: boolean;
 }