Trustless AI agent chapter

[matevz]

Based on Peter's code https://github.com/ptrus/verisage.xyz write a "Trustless AI agent" chapter to https://github.com/oasisprotocol/docs/tree/main/docs/build/use-cases

Base version: https://docs.base.org/cookbook/launch-ai-agents

[matevz]

Implemented in #1560 as part of the ElizaOS-based agent.