Add AGENTS.md

[magicmark]

https://agents.md/ is now a standard supported by most coding agents.

Seems worth adding - e.g. my instance of claude keeps trying to run things with uv, so this would teach it we're using poetry atm.

wdyt?

Summary by Sourcery

Documentation:

• Add AGENTS.md documenting repository setup, development commands, project structure, and pull request requirements for automated coding agents and contributors.

[sourcery-ai]

Reviewer's Guide

Adds an AGENTS.md file documenting project setup, commands, code style, structure, and PR requirements specifically to guide AI coding agents and contributors.

File-Level Changes

Change	Details	Files
Document project setup and development workflows for agents and contributors.	Describe dependency management and local setup using Poetry and pre-commit hooks List common development commands for tests, type checking, linting, and formatting Specify code style expectations including Ruff configuration, strict mypy typing, decorator-based schema, and async-first design Outline high-level project structure for core library, integrations, and tests Define PR requirements including RELEASE.md usage, release types, and testing expectations	AGENTS.md

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[sourcery-ai]

Hey - I've left some high level feedback:

• Double-check that the listed commands and tools (poetry, mypy strict, ruff, test markers, etc.) exactly match the current project setup and config files so AGENTS.md doesn’t drift from reality.
• Ensure the PR requirements in AGENTS.md (RELEASE.md requirement, release types, test expectations) are consistent with any existing CONTRIBUTING or release process docs to avoid conflicting guidance.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Double-check that the listed commands and tools (poetry, mypy strict, ruff, test markers, etc.) exactly match the current project setup and config files so AGENTS.md doesn’t drift from reality.
- Ensure the PR requirements in AGENTS.md (RELEASE.md requirement, release types, test expectations) are consistent with any existing CONTRIBUTING or release process docs to avoid conflicting guidance.

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[patrick91]

shall we add an example of release file too? 😊