docs: Update AGENTS.md

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Summary

• add the AGENTS guide capturing the current repository structure and workflows
• document development, testing, and CI expectations for contributors
• highlight reference files and playbooks for common tasks

Why

Keeping AGENTS.md updated gives automation agents and contributors a concise, authoritative reference that mirrors the present codebase layout and practices.

Summary

This PR adds a comprehensive AGENTS.md guide that outlines the repository’s purpose, structure, and workflows to help automation agents and contributors navigate the project. It consolidates development, testing, and CI expectations along with key references so documentation stays aligned with the current codebase.

Changes

• Documentation: Added AGENTS.md covering the project overview, directory structure, and development/testing workflows.
• Documentation: Documented coding guidelines, common playbooks, and reference resources for maintainers and agents.

Commits

• 5bb05a9 docs: update AGENTS.md

Testing

• Review AGENTS.md to confirm the documented structure and workflows reflect the current repository state.
• Verify the referenced scripts and CI steps (lint, test, build) remain accurate.

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