Generate AGENTS.md

Generate an AGENTS.md file containing essential information for AI agents working in this repository.

What to Include

The AGENTS.md file should be ~20 lines and contain:

1. Build/lint/test commands - Especially how to run a single test
2. Architecture overview - Important subprojects, internal APIs, databases
3. Code style guidelines - Imports, conventions, formatting, types, naming, error handling

Process