Feature: Node Types and Execution Across Agent, Function, Conditional, Subgraph, and Tool Nodes
  As a developer
  I want all node types to execute with proper input handling, edge conditions, and error propagation
  So that the graph execution engine handles every node type correctly

  Scenario: All Node code paths execute correctly
    Given a fresh nodes test context
    When I exercise all Node code paths
    Then all node code paths should execute correctly