[model-gateway] Optimize workflow engine with pre-computed dependency graph#15503
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[model-gateway] Optimize workflow engine with pre-computed dependency graph#15503
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… graph - Add reverse_deps and initial_step_indices to WorkflowDefinition - Build dependency graph during validate() (O(N+E) once at registration) - Replace O(N²) step scanning with event-driven readiness checking - Use VecDeque to track only steps whose dependencies just completed - Add get_dependent_indices() and get_initial_step_indices() for O(1) lookup - Remove unused get_dependents() method
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