Reasoning agent examples for the ASTRA LLM Integration guide.

Requires Java 17+, Maven, ASTRA 2.3.0 and an OpenAI API key in OPENAI_API_KEY.
Run one example with, for example:
    mvn -Dastra.main=Direct
The examples are Direct, ZeroShot, FewShot, Steps, Tools, Passages and Tree.
Each run makes one or more remote model calls and can incur provider charges.
See the Reasoning Agents pages in the ASTRA guide for explanations.
