Full test coverage for OperatorDomainService — fix dead code branches and missing edge cases

[Copilot]

OperatorDomainService had several uncovered branches: the stateResult.IsFailed path in UpdateOperator was permanently dead code, the Guid.Empty operatorId path in CreateOperator was untested, and both methods had copy-paste bugs where estateResult.IsFailed was checked twice instead of checking operatorResult.IsFailed.

Bug fixes

• CreateOperator / UpdateOperator: both methods re-checked estateResult.IsFailed after fetching the operator aggregate instead of operatorResult.IsFailed, silently swallowing operator fetch failures.

Dead code elimination — UpdateOperator stateResult.IsFailed

OperatorAggregate.UpdateOperator always returned Result.Success(), making the service's stateResult.IsFailed guard unreachable. Fixed by adding an IsCreated validation to the aggregate method (where domain validation belongs) and removing the duplicate service-level guard:

// OperatorAggregate.UpdateOperator — domain validation now lives here
if (aggregate.IsCreated == false)
    return Result.Invalid("Operator has not been created");

The service-level if (operatorAggregate.IsCreated == false) guard introduced in an earlier pass is removed; stateResult.IsFailed is now the single coverage path for this case.

New / fixed tests

Test	Covers
CreateOperator_OperatorIdIsEmpty_OperatorIsCreated	Guid.Empty → Guid.NewGuid() switch in CreateOperator
CreateOperator_OperatorNameEmpty_ResultFailed	stateResult.IsFailed in CreateOperator (aggregate rejects empty name)
CreateOperator_GetEstateFailed / GetOperatorFailed / SaveFailed / ExceptionThrown	All failure exits in CreateOperator
UpdateOperator_OperatorNotCreated_ResultFailed	stateResult.IsFailed in UpdateOperator (now via aggregate validation) — previously passed accidentally due to missing mock
UpdateOperator_GetEstateFailed / EstateNotCreated / GetOperatorFailed / SaveFailed / ExceptionThrown	All failure exits in UpdateOperator

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update Test Coverage on Operator Domain service</issue_title>
<issue_description>Each domain service method needs new tests added to cover all cases, failure and exception cases need to be covered.</issue_description>

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

• Fixes Update Test Coverage on Operator Domain service #912

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