feat(rebar): range checks for the block rebar settings (승인 2026-10-26)

- RB01 a setting outside its range (cover 50–100, side cover 50–100, first gap
  0–150, spacing S1/S2 100–200, leg 500–1000); RB02 S1 depth at or above the
  block height; RB03 the legs do not reach into the coping.

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

src/core/rebar/block-check.ts

@@ -0,0 +1,54 @@
+import type { PierModel } from '../geometry';
+import type { Issue, PierInput } from '../types';
+import { barDepths, DEFAULT_BLOCK_REBAR, type BlockRebarSettings } from './bearing-block';
+
+/**
+ * 받침블럭 철근 입력 범위 (승인 2026-10-26, 제안 범위 확인).
+ * RB01: a setting outside its range. RB02: the S2 bar sits at or below the block top-to-bottom height.
+ * RB03: the bar legs do not reach into the coping (묻힘 < 0).
+ */
+export const BLOCK_REBAR_RANGES: Record<keyof BlockRebarSettings, [number, number]> = {
+  coverTop: [50, 100],
+  coverSide: [50, 100],
+  firstGap: [0, 150],
+  spacingS1: [100, 200],
+  spacingS2: [100, 200],
+  legLength: [500, 1000],
+};
+
+const LABELS: Record<keyof BlockRebarSettings, string> = {
+  coverTop: '상면 피복',
+  coverSide: '측면 피복',
+  firstGap: '첫 철근 최소 여유',
+  spacingS1: '간격 S1',
+  spacingS2: '간격 S2',
+  legLength: '다리 길이',
+};
+
+export function checkBlockRebar(input: PierInput, model: PierModel): Issue[] {
+  const s: BlockRebarSettings = { ...DEFAULT_BLOCK_REBAR, ...input.blockRebar };
+  const out: Issue[] = [];
+  const add = (code: string, message: string) => out.push({ code, level: 'W', pier: input.name, message });
+
+  for (const key of Object.keys(BLOCK_REBAR_RANGES) as (keyof BlockRebarSettings)[]) {
+    const [lo, hi] = BLOCK_REBAR_RANGES[key];
+    if (s[key] < lo || s[key] > hi) add('RB01', `${LABELS[key]} ${s[key]} mm가 범위 ${lo}–${hi} mm를 벗어납니다.`);
+  }
+
+  const depth = barDepths(s);
+  for (const b of model.blocks) {
+    const height = (b.top - b.bottom) * 1000;
+    if (depth.S1 >= height) {
+      add('RB02', `블럭 높이 ${height.toFixed(0)} mm보다 S1 깊이 ${depth.S1.toFixed(1)} mm가 깊습니다.`);
+      break;
+    }
+  }
+  for (const b of model.blocks) {
+    const height = (b.top - b.bottom) * 1000;
+    if (s.legLength - (height - depth.S1) < 0) {
+      add('RB03', `다리 끝이 코핑 안에 묻히지 않습니다 (블럭 ${b.no}).`);
+      break;
+    }
+  }
+  return out;
+}

src/core/validate.ts

@@ -2,6 +2,7 @@ import { DIM, type PierModel } from './geometry';
 import type { Issue, PierInput, PierType } from './types';
 import { validateGround, validatePileEmbedment, validateStrataNValues } from './ground';
 import { integratedCheck } from './bearing-layout';
+import { checkBlockRebar } from './rebar/block-check';
 
 const EXPECTED_COLUMNS: Record<PierType, number> = { 'T형': 1, '2주형': 2, '3주형': 3 };
 
@@ -94,6 +95,7 @@ export function validatePier(input: PierInput, model: PierModel, issues: Issue[]
   validateGround(input, issues);
   validatePileEmbedment(input, model, issues);
   validateStrataNValues(input, issues);
+  issues.push(...checkBlockRebar(input, model));
   // 일체 (승인 2026-10-26): the model builds one stepped block per pair when allowed; otherwise it keeps 분리.
   if (input.bearingLayout === '일체') {
     const check = integratedCheck(model.blocks);