Development environment setup

[jaypov99]

Document the development environment setup and verification by adding AGENTS.md.

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Note

Low Risk
Documentation-only change adding developer/CI run instructions; no runtime or logic modifications.

Overview
Adds AGENTS.md documenting development/setup expectations for Cursor Cloud, including key package.json commands (lint/build/test/start), guidance on using vitest run for non-watch test execution, and notes for running the server with a config (including HTTP-only tips), the /stats.json endpoint, and the uWebSockets.js native dependency.

^{Written by Cursor Bugbot for commit 8f29328. This will update automatically on new commits. Configure here.}

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
_{Learn more about Cursor Agents}