Add AGENTS.md with Cursor Cloud dev environment instructions

[ibrahima]

Summary

Sets up and documents the development environment for this repo's two independent components and adds an AGENTS.md with durable, non-obvious startup/run guidance for future cloud agents.

• skills-ref/ — Python reference CLI/library managed with uv (Python >=3.11).
• docs/ — Mintlify documentation site (npm run dev → mint dev, serves on http://localhost:3000).

The only file change is the new AGENTS.md; no application code was modified. Dependency installation (uv, mint) is handled via the VM snapshot + startup update script, not repo changes.

Verification

skills-ref/ (Python)

• uv run pytest — 40 passed
• uv run ruff check . — all checks passed
• uv run ruff format --check . — 11 files already formatted
• CLI hello-world: created a sample hello-world skill and ran validate (valid), read-properties (JSON), and to-prompt (XML)

docs/ (Mintlify)

• mint dev serves at http://localhost:3000 (redirects / → /home, HTTP 200)
• Browser walkthrough: homepage rendered, navigated via sidebar to the Specification page, content/tables/code blocks rendered correctly

docs_site_navigation_demo.mp4

Docs homepage
Docs specification page

_{To show artifacts inline, enable in settings.}