test: E2E 6·7차 테스트 결과 및 개발팀 수정 요청서 (176 PASS / 8 FAIL)

- 6차 결과: 180/184 PASS (97.8%) - 시나리오 내성 강화 효과
- 7차 결과: 176/184 PASS (95.7%) - Board 삭제 리그레션 발생
- step-executor.js: wait_for_table allowEmpty 옵션 추가
- run-all.js: --iterate, --stage 모드 추가
- 개발팀 수정 요청서: BUG-BOARD-DELETE-001(신규), BUG-DEPOSIT-001, BUG-SALES-CALC-001

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

e2e/runner/step-executor.js

@@ -513,6 +513,8 @@
           level2: step.level2,
           script: step.script,
           duration: step.duration,
+          timeout: step.timeout,
+          allowEmpty: step.allowEmpty,
           verification: step.verification,
           verify: step.verify,
           expected: step.expected,
@@ -937,6 +939,7 @@
 
     async wait_for_table(action, ctx) {
       const timeout = action.timeout || 10000;
+      const loopTimeout = action.allowEmpty ? Math.max(timeout - 2000, 3000) : timeout;
       const rowSelectors = [
         'table tbody tr',
         '[role="table"] [role="row"]',
@@ -944,13 +947,16 @@
         '[class*="table"]:not([class*="tooltip"]) tbody tr',
       ];
       const t0 = now();
-      while (now() - t0 < timeout) {
+      while (now() - t0 < loopTimeout) {
         for (const sel of rowSelectors) {
           const rows = document.querySelectorAll(sel);
           if (rows.length > 0) return pass(`Table loaded: ${rows.length} rows`);
         }
         await sleep(300);
       }
+      if (action.allowEmpty) {
+        return pass('Table loaded: 0 rows (allowEmpty)');
+      }
       return fail('Timeout waiting for table data');
     },