fix(extension): diff_review RPC parameter experiment — 4 format variants (A/B/C/D) + known-issues update

tests/test_diff_review.py

@@ -19,7 +19,13 @@ def multiply(a: int, b: int) -> int:
     return a * b
 
 
+def subtract(a: int, b: int) -> int:
+    """두 숫자를 뺍니다. (v0.3.13 diff_review 테스트용)"""
+    return a - b
+
+
 if __name__ == "__main__":
     print(hello("User"))
     print(add(1, 2))
     print(multiply(3, 4))
+    print(subtract(10, 3))