docs: add AGENTS.md with build commands and architecture guide

[adriantam]

Description

What problem is being solved?

Add comprehensive documentation for AI coding agents.

How is it being solved?

What changes are made to solve it?

References

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

Summary by CodeRabbit

• Documentation
  • Added comprehensive guidance documentation covering project overview, build instructions, package-specific workflows, architecture details, and development conventions for contributors.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[dosubot]

Related Documentation

Checked 5 published document(s) in 1 knowledge base(s). No updates required.

^{How did I do? Any feedback?}  

[coderabbitai]

Walkthrough

A new documentation file AGENTS.md is added providing guidance for AI coding agents, including project overview, published packages, build commands, package-specific workflows, architecture layout, feature parity, and critical implementation notes.

Changes

Cohort / File(s)	Summary
Documentation AGENTS.md	New file with comprehensive guidance for AI coding agents covering project setup, package information, build workflows, architecture, and development conventions.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: adding a new AGENTS.md documentation file with build commands and architecture guidance.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch aiagents

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[Siddhant-K-code]

Loved this ❤️

[SoulPancake]

LGTM