PaymentService 정책 기반 전환 (BAIS-POLICY-1783705261)

.forge/BAIS-POLICY-1783705261-attempt-1.md

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+# BAIS-POLICY-1783705261-attempt-1
+
+Forge 이슈 작업 브랜치 `forge/BAIS-POLICY-1783705261-attempt-1`.

src/main/java/com/example/baispolicy/PaymentService.java

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+package com.example.baispolicy;
+
+public class PaymentService {
+    public String approve(String transactionId) {
+        if (transactionId == null || transactionId.isBlank()) {
+            throw new IllegalArgumentException("Transaction ID cannot be blank");
+        }
+        return "APPROVED:" + transactionId;
+    }
+}