[ polishing ] agent vs logicunit (tool)

[flynntsang]

User Story

• As someone new to Eidolon
• I want to understand the difference between an agent and a logic unit (tool) (for example what's the difference between the API agent and the API logic unit)
• So I know why and how to implement:
  • sdk/eidolon_ai_sdk/agent/agent.py
  • sdk/eidolon_ai_sdk/apu/logic_unit.py

Acceptance Criteria

• Given that I want build an agentic application using Eidolon
• When I read the online documentation
• Then I understand what agents and logic units (tools) do and how to implement them

Check status of #423 as a potential dependency before picking this up.

[flynntsang]

Note that we have both a built-in agent and built-in logic unit for using APIs:

• sdk/eidolon_ai_sdk/agent/api_agent.py
• sdk/eidolon_ai_sdk/builtins/logic_units/api_logic_unit.py