Development environment setup

[masnwilliams]

Add AGENTS.md to document Cursor Cloud-specific development environment gotchas and instructions for future agents.

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Note

Low Risk
Low risk because this PR only adds documentation and does not change runtime code or build artifacts.

Overview
Adds a new AGENTS.md document with Cursor Cloud-specific development setup guidance, including common commands and environment/Docker/Firecracker gotchas (e.g., UKC_METRO usage, Docker driver/iptables requirements, CDP proxy behavior, image naming/quota constraints, and Go version expectations).

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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