feat(input): use RAG/운곡교P1입력.xlsx as the P1 input

- public/samples/운곡교P1입력.xlsx is a byte copy of RAG/운곡교P1입력.xlsx
- loadP1 and the sample loader read the three-sheet input
- spec workbook (intent.PR) stays for the single-sheet regression tests
- test: input file has sheets 교각 · IP · 받침 and parses to P1 with no issues

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

tests/helpers.ts

@@ -4,14 +4,21 @@ import * as XLSX from 'xlsx';
 import { parseWorkbook } from '../src/core/parseWorkbook';
 import type { PierInput } from '../src/core/types';
 
-const P1_PATH = fileURLToPath(new URL('../public/samples/P1.xlsx', import.meta.url));
+/** Spec workbook (RAG/Pier ui_xxx.xlsx, sheet intent.PR, all tables on one sheet). Used by single-sheet tests. */
+const SPEC_PATH = fileURLToPath(new URL('../public/samples/P1.xlsx', import.meta.url));
+/** User input (RAG/운곡교P1입력.xlsx, three sheets 교각 · IP · 받침). This is the P1 input used by the app and tests. */
+const INPUT_PATH = fileURLToPath(new URL('../public/samples/운곡교P1입력.xlsx', import.meta.url));
 
-export function loadWorkbook(path: string = P1_PATH): XLSX.WorkBook {
+export function loadWorkbook(path: string = SPEC_PATH): XLSX.WorkBook {
   return XLSX.read(readFileSync(path), { type: 'buffer' });
 }
 
+export function loadInputWorkbook(): XLSX.WorkBook {
+  return loadWorkbook(INPUT_PATH);
+}
+
 export function loadP1(): PierInput {
-  const { piers, issues } = parseWorkbook(loadWorkbook());
+  const { piers, issues } = parseWorkbook(loadInputWorkbook());
   if (issues.length) throw new Error(`P1 parse issues: ${JSON.stringify(issues)}`);
   const p1 = piers.find((p) => p.name === 'P1');
   if (!p1) throw new Error('P1 not found');