fix: resolve all test failures after vitest 2.x upgrade

- Attach rejects handler before advancing timers (vitest 2.x strict mode)
- Fix FK constraint cleanup order in test setup
- Fix 7-char prefix matching test data
- Add INSERT OR IGNORE for deposit concurrency safety
- Add secondary ORDER BY for deterministic transaction ordering
- Update summary-service test assertions to match current prompt

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

src/agents/deposit-agent.ts

@@ -438,16 +438,25 @@ export async function executeDepositFunction(
 ): Promise<DepositFunctionResult> {
   const { userId, isAdmin, db } = context;
 
-  // 예치금 계정 조회 또는 생성
+  // 예치금 계정 조회 또는 생성 (동시성 안전)
   let deposit = await db.prepare(
     'SELECT id, balance FROM user_deposits WHERE user_id = ?'
   ).bind(userId).first<{ id: number; balance: number }>();
 
   if (!deposit) {
+    // INSERT OR IGNORE로 동시 요청 시 UNIQUE 제약 위반 방지
     await db.prepare(
-      'INSERT INTO user_deposits (user_id, balance) VALUES (?, 0)'
+      'INSERT OR IGNORE INTO user_deposits (user_id, balance) VALUES (?, 0)'
     ).bind(userId).run();
-    deposit = { id: 0, balance: 0 };
+
+    // 재조회 (다른 요청이 먼저 생성했을 수 있음)
+    deposit = await db.prepare(
+      'SELECT id, balance FROM user_deposits WHERE user_id = ?'
+    ).bind(userId).first<{ id: number; balance: number }>();
+
+    if (!deposit) {
+      deposit = { id: 0, balance: 0 };
+    }
   }
 
   switch (funcName) {
@@ -595,7 +604,7 @@ export async function executeDepositFunction(
         `SELECT id, type, amount, status, depositor_name, description, created_at, confirmed_at
          FROM deposit_transactions
          WHERE user_id = ?
-         ORDER BY created_at DESC
+         ORDER BY created_at DESC, id DESC
          LIMIT ?`
       ).bind(userId, limit).all<{
         id: number;