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Add comprehensive guides explaining: - Workflow Graphs (nodes, edges, validation) - Function Nodes (wrapping functions and generators) - Join Nodes (aggregating parallel branches) - Retry Config (resilience policies) - Parallel Workers (concurrent list processing) - Dynamic Nodes (runtime execution) Update the main guides index and the adk-unit-guide skill rules. Co-authored-by: Bo Yang <ybo@google.com> PiperOrigin-RevId: 933979245