gitv2

Commit: 9340a97

Date: June 10, 2025 at 10:03 PM

• Basic types to be implemented in the first iteration

The first iteration targets to demonstrate

LLMAgent and simple Tool calls.

• move all basic types to the top-level package ('adk').
• move runner to internal/runner package.
• concrete implementations of selected core agent, model, tool

will be in `agent`, `model`, and `tool` subdirectories.