Update test coverage for Float Domain service

[Copilot]

FloatDomainService lacked test coverage for failure and exception paths across all four service methods. RecordTransaction had no tests at all.

New tests added

CreateFloatForContractProduct

• GetFloatFailed — GetLatest<FloatAggregate> returns failure
• SaveFailed — AggregateService.Save returns failure
• ExceptionThrown — exception propagated through try/catch

RecordCreditPurchase (FloatCommands)

• GetFloatFailed — GetLatest<FloatAggregate> returns failure

RecordCreditPurchase (FloatActivityCommands)

• GetFloatActivityFailed — GetLatest<FloatActivityAggregate> returns failure

RecordTransaction (all new)

• TransactionRecorded — happy path
• GetTransactionFailed — GetLatest<TransactionAggregate> returns failure
• GetFloatActivityFailed — GetLatest<FloatActivityAggregate> returns failure
• SaveFailed — AggregateService.Save returns failure
• ExceptionThrown — exception propagated through try/catch

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

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.BusinessLogic.Tests/TransactionProcessor.BusinessLogic.Tests.csproj --filter FloatDomainService --no-build .Testing/TestData.cs (dns block)
  • Triggering command: /usr/bin/dotnet dotnet build TransactionProcessor.BusinessLogic.Tests/TransactionProcessor.BusinessLogic.Tests.csproj (dns block)
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.24.0/x64/codeql/csharp/tools/linux64/Semmle.Autobuild.CSharp /opt/hostedtoolcache/CodeQL/2.24.0/x64/codeql/csharp/tools/linux64/Semmle.Autobuild.CSharp (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update Test Coverage on Float Domain service</issue_title>
<issue_description>Each domain service method needs new tests added to cover all cases, including failure and exceptions.</issue_description>

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

• Fixes Update Test Coverage on Float Domain service #918

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