List of agents / LLMs.

_↴ Ported from [flutter/genui#750](https://github.com/flutter/genui/issues/750) — originally opened by [polina-c](https://github.com/polina-c) on 2026-02-21._
_Original labels: P2, front-line-handled, a: api-simplicity_

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Document and/or create examples for agents, that are pluggable into genui, and their pros and cons.

Look for existing agent integrations in the codebase, likely under a directory like 'src/agents' or 'examples/'. Review how agents are currently plugged into genui. Document each agent's setup, usage, and trade-offs, and create clear examples. Check for any existing documentation on agent configuration to understand the expected format.

Written by the indexing model from the issue text.