- Introduced three test workflows:
- `StartInFlowchartAsExplicitStartWorkflow`: Verifies the explicit `Start` activity in a flowchart as a starting point.
- `StartInFlowchartWithStartPropertyWorkflow`: Confirms precedence of `Flowchart.Start` property over the `Start` activity.
- `StartInSequenceWorkflow`: Demonstrates successful `Start` activity usage in a sequence.
- Added integration tests (`StartTests`) ensuring expected execution flows and `Start` activity behavior for each workflow.
- Added unit tests validating `Start` activity implementation and compliance with `IStartNode`.
- Ensures test coverage for `Start` activity behavior across flowchart, sequence, and property overrides.
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