docs: add AGENTS.md for AI-assisted development

[czirker]

Summary

• Adds AGENTS.md with repo-specific context

Task Reference

• Jira: https://chb.atlassian.net/browse/ES-2710

Made with Cursor

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Note

Low Risk
Low risk: documentation-only change that adds no runtime code or behavioral modifications.

Overview
Adds AGENTS.md, a repository-specific reference for AI-assisted development describing the SDK’s purpose, key APIs, project layout, configuration/testing workflows, and common gotchas.

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