forge: open work branch for SPRING-ARC-REVIEW-1783835414-attempt-1-run-a3982b304324

.forge/SPRING-ARC-REVIEW-1783835414-attempt-1-run-a3982b304324.md

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+# SPRING-ARC-REVIEW-1783835414-attempt-1-run-a3982b304324
+
+Forge 이슈 작업 브랜치 `forge/SPRING-ARC-REVIEW-1783835414-attempt-1-run-a3982b304324`.

.forge/iss-81c03d204ddd-attempt-1-run-c46c886cd339.md

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-# iss-81c03d204ddd-attempt-1-run-c46c886cd339
-
-Forge 이슈 작업 브랜치 `forge/iss-81c03d204ddd-attempt-1-run-c46c886cd339`.

docs/architecture/transaction-sequence.md

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-```mermaid
-sequenceDiagram
-    participant User
-    participant PaymentGateway
-    participant PaymentService
-    participant Database
-
-    User->>+PaymentService: Start Payment
-    PaymentService->>+PaymentGateway: Process Payment
-    PaymentGateway-->>-PaymentService: Payment Success
-    PaymentService->>Database: Record Payment
-    Database-->>-PaymentService: Payment Recorded
-    PaymentService-->>-User: Payment Confirmed
-
-    %% External Failure
-    User->>+PaymentService: Start Payment
-    PaymentService->>+PaymentGateway: Process Payment
-    PaymentGateway-->>-PaymentService: Payment Failed
-    PaymentService-->>-User: Payment Failed
-
-    %% DB Failure
-    User->>+PaymentService: Start Payment
-    PaymentService->>+PaymentGateway: Process Payment
-    PaymentGateway-->>-PaymentService: Payment Success
-    PaymentService->>Database: Record Payment
-    Database-->>-PaymentService: DB Failure
-    PaymentService-->>-User: Payment Processing Error
-
-    %% Commit/Rollback
-    Note over PaymentService: Commit if successful
-    Note over PaymentService: Rollback if there's an error
-```