Add AGENTS.md with Cursor Cloud development instructions

[Ibrahimrahhal]

Adds AGENTS.md with development environment instructions for Cursor Cloud agents.

What's included

• Overview of the Corgea CLI project (Rust CLI, no local services)
• Development commands: build, test, lint, dev install
• Key caveats: Rust toolchain version requirement (>=1.85), python3.12-venv dependency, API token requirement, debug config persistence

Environment setup verified

• Build: cargo build succeeds
• Test: cargo test — all 7 unit tests pass
• Lint: cargo clippy — no errors (warnings only)
• Dev install: maturin develop — builds and installs CLI as Python package
• CLI: corgea --help, corgea --version, corgea list, corgea scan all work correctly

Hello world: authenticated scan

Successfully ran a BLAST scan against src/main.rs, which packaged the file, uploaded to Corgea, waited for server-side scan completion, and displayed results.

hello_world_scan.log

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