Update block docs for: __init__.md

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+## Agent Executor
+
+### What it is
+A specialized block that enables the execution of an existing agent within another agent, allowing for nested agent operations.
+
+### What it does
+This block manages the execution of a pre-configured agent (graph) and processes its outputs. It handles the entire lifecycle of the agent execution, including monitoring its status and collecting results.
+
+### How it works
+1. Receives execution parameters including user identification and graph details
+2. Initiates the execution of the specified agent
+3. Monitors the execution progress through an event system
+4. Collects and processes outputs from the agent
+5. Reports execution status and results
+6. Continues monitoring until the execution is completed, terminated, or fails
+
+### Inputs
+- User ID: The identifier for the user initiating the execution
+- Graph ID: The unique identifier of the agent (graph) to be executed
+- Graph Version: The specific version number of the agent to run
+- Data: The input data that will be provided to the agent for processing
+- Input Schema: The structure definition that describes the expected input format
+- Output Schema: The structure definition that describes the expected output format
+
+### Outputs
+- Dynamic Outputs: The block yields outputs based on the executed agent's results
+- Each output consists of:
+  - Output Name: A label identifying the type of output
+  - Output Data: The actual data produced by the executed agent
+
+### Possible use case
+A customer service automation system where a main agent needs to delegate specific tasks to specialized sub-agents. For example, a primary customer service agent might use this block to execute a specialized product recommendation agent when a customer asks for product suggestions. The main agent can continue its conversation while the recommendation agent processes the request and returns detailed product recommendations.
+