feat(b09): 계약내역 탭 등록 — 설계 뒤 계약 단계라 틀 맨 끝(랩탑_메인 26097d69)

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016VBGFXB9AbJBwXP19z75Qq

B09_Estimation/B09_Estimation_UI_Shell.ts

@@ -26,6 +26,7 @@ import { designDocTab } from "./B09_Estimation_UI_Tab_DesignDoc";
 import { basisSheetTab } from "./B09_Estimation_UI_Tab_BasisSheet";
 import { supplyTab } from "./B09_Estimation_UI_Tab_Supply";
 import { baseDataTab } from "./B09_Estimation_UI_Tab_BaseData";
+import { contractTab } from "./B09_Estimation_UI_Tab_Contract";
 
 /** 탭 등록 — 한 줄에 탭 하나. */
 const TABS: B09Tab[] = [
@@ -42,6 +43,7 @@ const TABS: B09Tab[] = [
   baseDataTab,
   designDocTab,
   basisSheetTab,
+  contractTab, // 랩탑_메인 — 설계 뒤 계약 단계라 맨 끝
 ];
 
 export async function renderB09Estimation(root: HTMLElement): Promise<void> {