[CLAUDE] PurchaseEvaluation: cho luu khi vuot ngan sach - chi canh bao mem (bo chan so am "Gia tri thuc hien du kien con lai") (UAT anh Kiet S62)

- Root cause: o "Gia tri thuc hien du kien con lai" (row 8 bang Tong hop ngan sach) khi gia tri NCC vuot ngan sach -> so du con lai ra AM; BE validator ExpectedRemainingAmount>=0 + FE VndInlineEdit khong bat allowNegative -> chan cung "am ko luu duoc" (testing bao qua anh Kiet)
- BE: AdjustPurchaseEvaluationBudgetCommandValidator GO rule ExpectedRemainingAmount.GreaterThanOrEqualTo(0) -> cho luu so am (mirror tien le LeaveBalance AllowsNegativeRemaining). GIU BudgetPeriodAmount>0 + submit-guard "da nhap NS ky nay" khong doi
- FE x2 app SHA256 identical: (a) allowNegative cho VndInlineEdit row 8; (b) banner amber "Vuot ngan sach - van luu & gui duyet duoc" trong PeBudgetSummaryTable khi cmpPeriod<0 || cmpFull<0. Tang to mau do cu GIU NGUYEN
- Spec change: flip test AdjustBudget_Validator_ExpectedRemainingNegative_FailsValidation -> _PassesValidation (am gio hop le); test BudgetPeriodZero_FailsValidation GIU (budget>0 van enforced)
- Build FE x2 PASS + test 263 PASS (45 Domain + 218 Infra, 0 fail/skip). Reviewer PASS 0 issue (row8 am an toan arithmetic additive-only, submit guard nguyen, mirror byte-identical, no scope creep)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/SolutionErp.Infrastructure.Tests/Application/PeWorkItemBudgetTests.cs

@@ -652,15 +652,15 @@ public class PeWorkItemBudgetTests
     }
 
     [Fact]
-    public void AdjustBudget_Validator_ExpectedRemainingNegative_FailsValidation()
+    public void AdjustBudget_Validator_ExpectedRemainingNegative_PassesValidation()
     {
-        // GreaterThanOrEqualTo(0) when HasValue → âm không hợp lệ (row 8 không cho âm).
+        // [S62] SPEC CHANGE — "Giá trị thực hiện dự kiến còn lại" (row 8) ÂM giờ HỢP LỆ.
+        // Vượt ngân sách → số dư còn lại ra âm; nghiệp vụ (anh Kiệt FDC) cho lưu, chỉ
+        // cảnh báo. Rule GreaterThanOrEqualTo(0) cũ đã gỡ. BudgetPeriodAmount=80 > 0 hợp lệ.
         var validator = new AdjustPurchaseEvaluationBudgetCommandValidator();
         var result = validator.Validate(new AdjustPurchaseEvaluationBudgetCommand(Guid.NewGuid(), 80m, -1m));
 
-        result.IsValid.Should().BeFalse();
-        result.Errors.Should().Contain(e =>
-            e.PropertyName == nameof(AdjustPurchaseEvaluationBudgetCommand.ExpectedRemainingAmount));
+        result.IsValid.Should().BeTrue();
     }
 
     [Fact]