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: adds documentation only and does not change runtime code, APIs, or build behavior.

Overview
Adds a new AGENTS.md file that documents repository context for AI-assisted development, including SDK purpose, tech stack, project layout, common dev/test commands, and a few build/peer-dependency gotchas.

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