Adds invoke system with centralized evaluation #99
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Implements complete invoke element support with handler-based security,
unified parameter processing, and full SCXML compliance.
Secure invoke handlers replace arbitrary function execution
Centralized parameter evaluation in Evaluator (strict/lenient modes)
Complete parsing with children support
SCXML-compliant event generation (done.invoke, error.execution, error.communication)
Unified Param structure replaces separate SendParam module
InvokeAction with 100% test coverage
InvokeHandler behavior for secure service integration
Enhanced parameter evaluation functions
StateChart-level handler registration prevents unauthorized execution
Parameter evaluation consolidated from SendAction and InvokeAction
Full SCXML specification compliance for external service communication
Co-Authored-By: Claude noreply@anthropic.com