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; no runtime code or configuration paths are modified.

Overview
Adds a new AGENTS.md guide with repo-specific context for AI-assisted development, including project overview, directory layout, key Leo/Serverless configuration knobs, basic local/test workflows, and branch/PR conventions.

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