[Paltidor87]

What does this PR do?

This PR documents the successful setup of the development environment for the leann codebase by adding AGENTS.md. It outlines the installation of system dependencies, Python packages, compilation of C++ backends, and verification via linting, testing, and a hello-world demo.

Related Issues

Fixes #

Checklist

• Tests pass (uv run pytest)
• Code formatted (ruff format and ruff check)
• Pre-commit hooks pass (pre-commit run --all-files)

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Note

Low Risk
Documentation-only change; no runtime behavior, APIs, or build scripts are modified.

Overview
Adds a new AGENTS.md with Cursor Cloud development environment setup instructions, including Ubuntu-specific build requirements for the C++ backends (compiler env vars, libstdc++.so symlink) and MKL install notes.

Documents common uv/ruff/pytest commands, calls out known pre-existing test/lint issues, and lists required system packages.

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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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