feat(ground): 하상 selectable; 설계홍수위 and 세굴 깊이 for 하상

- shape-options: a per-option "confirmed" flag; 하상 is confirmed, 해상 is not.
- The 위치 chips store the choice in the pier's draft; 선택 shows it.
- 하상: the groundwater inputs give way to 설계홍수위 DHWL (floodLevelEl) and
  세굴 깊이 (scourDepthM). The groundwater value is kept (남겨두기).
- Checks: G07 DHWL missing, G08 DHWL below the 지반고, G09 scour negative or
  the scour line below the footing bottom. The groundwater check is skipped for 하상.
- Section: the DHWL as a solid line and the 세굴선 dashed.

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

src/core/changes.ts

@@ -23,7 +23,7 @@ export const EDITABLE_FIELDS = [
 ] as const;
 
 /** Inputs tracked for overrides and pending changes: the numeric cards plus 열별 본수 (an array, compared by value). */
-export const TRACKED_KEYS = [...EDITABLE_FIELDS.map((f) => f.key), 'pileRows', 'groundPosition', 'groundWaterOn', 'groundWaterEl', 'strataRows'] as const;
+export const TRACKED_KEYS = [...EDITABLE_FIELDS.map((f) => f.key), 'pileRows', 'groundPosition', 'groundWaterOn', 'groundWaterEl', 'floodLevelEl', 'scourDepthM', 'strataRows'] as const;
 
 export type EditableKey = (typeof TRACKED_KEYS)[number];
 
@@ -47,6 +47,8 @@ export const FIELD_LABELS: Record<EditableKey, string> = {
   groundPosition: '지반 위치',
   groundWaterOn: '지하수위 고려',
   groundWaterEl: '지하수위 EL',
+  floodLevelEl: '설계홍수위 DHWL',
+  scourDepthM: '세굴 깊이',
   strataRows: '지층 행',
 };
 

src/core/copy.ts

@@ -21,7 +21,7 @@ export const COPY_ITEMS: Record<CopyItem, ItemRule> = {
   'coping-length': { label: '코핑 길이 L', keys: ['copingLengthMm'], defaultOn: false, pileItem: false },
   'pile-length': { label: '말뚝 길이', keys: ['pileLengthMm'], defaultOn: false, pileItem: true },
   'pile-rows': { label: '열별 본수', keys: ['pileRows'], defaultOn: false, pileItem: true },
-  'ground-position': { label: '지반 위치·지하수위', keys: ['groundPosition', 'groundWaterOn', 'groundWaterEl'], defaultOn: false, pileItem: false },
+  'ground-position': { label: '지반 위치·지하수위', keys: ['groundPosition', 'groundWaterOn', 'groundWaterEl', 'floodLevelEl'], defaultOn: false, pileItem: false },
 };
 
 export const DEFAULT_COPY_ITEMS: CopyItem[] = (Object.keys(COPY_ITEMS) as CopyItem[]).filter((k) => COPY_ITEMS[k].defaultOn);

src/core/ground.ts

@@ -16,7 +16,8 @@ export const PILE_EMBED_D = 1.0;
 /**
  * 지반·지층 입력 검사 (승인 2026-10-26).
  * G01: 층 하단 EL은 위 경계보다 낮아야 함. G02: 지하수위는 지반고와 가장 아래 층 사이에 있어야 함.
- * G03: 층 이름은 지층 목록에 있어야 함. Ground values are inputs only; they do not change the 3D model.
+ * G03: 층 이름은 지층 목록에 있어야 함. 하상: G07 DHWL 없음, G08 DHWL이 지반고보다 낮음, G09 세굴선 확인.
+ * Ground values are inputs only; they do not change the 3D model.
  */
 export function validateGround(input: PierInput, issues: Issue[]): void {
   const rows = input.strataRows ?? [];
@@ -31,7 +32,24 @@ export function validateGround(input: PierInput, issues: Issue[]): void {
     }
     upper = row.bottomEl;
   });
-  if (input.groundWaterOn) {
+  const position = input.groundPosition ?? '육상';
+  if (position === '하상') {
+    // 하상 (승인 2026-10-26): the 설계홍수위 DHWL replaces the groundwater level.
+    const f = input.floodLevelEl;
+    if (f === undefined || !Number.isFinite(f)) {
+      issues.push({ code: 'G07', level: 'W', pier: input.name, message: '하상입니다. 설계홍수위(DHWL) EL을 입력하세요.' });
+    } else if (f < input.groundEl) {
+      issues.push({ code: 'G08', level: 'W', pier: input.name, message: `설계홍수위 ${f.toFixed(3)}이 지반고 ${input.groundEl.toFixed(3)}보다 낮습니다.` });
+    }
+    const scour = input.scourDepthM;
+    if (scour !== undefined) {
+      if (!(scour >= 0)) {
+        issues.push({ code: 'G09', level: 'W', pier: input.name, message: '세굴 깊이는 0 이상이어야 합니다.' });
+      } else if (input.groundEl - scour < input.footingBottomEl) {
+        issues.push({ code: 'G09', level: 'W', pier: input.name, message: `세굴선 EL ${(input.groundEl - scour).toFixed(3)}이 확대기초 하면 ${input.footingBottomEl.toFixed(3)}보다 낮습니다 (기초 노출).` });
+      }
+    }
+  } else if (input.groundWaterOn) {
     const w = input.groundWaterEl;
     const lowest = rows.length ? rows[rows.length - 1].bottomEl : undefined;
     if (w === undefined || !Number.isFinite(w)) {

src/core/shape-options.ts

@@ -8,6 +8,8 @@ export interface ShapeOption {
   label: string;
   /** 굵은 글씨 in the spec: the default that the 1단계 model builds. */
   isDefault: boolean;
+  /** The rule for this option is confirmed (승인 2026-10-26: 하상), so it can be chosen even if it is not the default. */
+  confirmed?: boolean;
 }
 
 export interface ShapeGroup {
@@ -17,6 +19,7 @@ export interface ShapeGroup {
 
 const d = (label: string): ShapeOption => ({ label, isDefault: true });
 const x = (label: string): ShapeOption => ({ label, isDefault: false });
+const ok = (label: string): ShapeOption => ({ label, isDefault: false, confirmed: true });
 
 export const SHAPE_GROUPS: Record<MemberId, ShapeGroup[]> = {
   bearing: [{ title: '배치', options: [d('분리'), x('일체')] }],
@@ -34,14 +37,14 @@ export const SHAPE_GROUPS: Record<MemberId, ShapeGroup[]> = {
     { title: '말뚝 종류', options: [d('강관'), x('PHC'), x('복합')] },
     { title: '경사말뚝', options: [d('없음'), x('있음')] },
   ],
-  ground: [{ title: '위치', options: [d('육상'), x('하상'), x('해상')] }],
+  ground: [{ title: '위치', options: [d('육상'), ok('하상'), x('해상')] }],
 };
 
 export const UNDEFINED_REASON = '규칙 미정 (Q6 확정 전 선택 불가)';
 
-/** Options currently selectable. Defaults are the only choices today. */
+/** Options currently selectable: the defaults and the options whose rule is confirmed. */
 export function isSelectable(option: ShapeOption): boolean {
-  return option.isDefault;
+  return option.isDefault || option.confirmed === true;
 }
 
 /** The default summary of a member, e.g. "교좌면 직각 · 하면 직선". */

src/core/types.ts

@@ -61,6 +61,10 @@ export interface PierInput {
   groundPosition?: GroundPosition;
   groundWaterOn?: boolean;
   groundWaterEl?: number;
+  /** 설계홍수위 DHWL (m), used for 하상 only. Kept when the position changes (승인 2026-10-26). */
+  floodLevelEl?: number;
+  /** 세굴 깊이 (m) below the 지반고, used for 하상 only. */
+  scourDepthM?: number;
   strataRows?: StrataRow[];
 }