Reduce reconciliation processing complexity in TransactionDomainService

[Copilot]

TransactionDomainService.ProcessReconciliationTransaction exceeded the configured cyclomatic complexity threshold. This change flattens the method by moving the reconciliation state transitions and validation outcome handling into focused private helpers, while preserving the existing reconciliation flow.

• Refactor reconciliation flow

  • Extracted the reconciliation state transition sequence into a dedicated helper
  • Kept aggregate loading, save behavior, and response construction in the public method

• Isolate validation branching

  • Moved the authorise/decline decision into a small helper
  • Removed the main source of branching from ProcessReconciliationTransaction

• Behavior preserved

  • Reconciliation still executes in the same order:
    1. start reconciliation
    2. record totals
    3. apply validation result
    4. complete reconciliation
    5. save aggregate
    6. return response

Result stateResult = this.ProcessReconciliation(reconciliationAggregate, command, validationResult);
if (stateResult.IsFailed)
    return ResultHelpers.CreateFailure(stateResult);

This keeps the public method focused on orchestration and error propagation while reducing analyzer-reported complexity.

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• f.feedz.io
  • Triggering command: /usr/bin/dotnet dotnet test TransactionProcessor.sln (dns block)
  • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/TransactionProcessor/TransactionProcessor/TransactionProcessor.BusinessLogic.Tests/TransactionProcessor.BusinessLogic.Tests.csproj --filter ProcessReconciliationTransaction (dns block)
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.24.2/x64/codeql/csharp/tools/linux64/Semmle.Autobuild.CSharp /opt/hostedtoolcache/CodeQL/2.24.2/x64/codeql/csharp/tools/linux64/Semmle.Autobuild.CSharp (dns block)

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Original prompt

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This section details on the original issue you should resolve

<issue_title>[Complexity] Method TransactionDomainService::ProcessReconciliationTransaction has a cyclomatic complexity of 11 (limit is 8)</issue_title>
<issue_description>Codacy ID: 1e17c606bf145c744788b717fff46e35

File: TransactionProcessor.BusinessLogic/Services/TransactionDomainService.cs
Line: 152
Rule: Complexity (Warning)
Commit: 1575fbce860b4758f7b071d6e8f52f128f624bde

Message: Method TransactionDomainService::ProcessReconciliationTransaction has a cyclomatic complexity of 11 (limit is 8)

**Code Snippet:**
```csharp
        public async Task<Result<ProcessReconciliationTransactionResponse>> ProcessReconciliationTransaction(TransactionCommands.ProcessReconciliationCommand command, 
```

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Complexity] Method TransactionDomainService::ProcessReconciliationTransaction has a cyclomatic complexity of 11 (limit is 8) #1421

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