ecmwf-ifs/ecland — reverse-engineered prompt

I want you to get this ecLand project into a usable shape on my machine. It is the ECMWF land surface model, and I want to be able to compile it, run its own tests, and then run a simple standalone experiment with prepared forcing data when I provide an input folder.

Please inspect the repo, use the intended bundled build workflow, install or point to the needed compilers and climate data libraries, and make the setup work on Linux or macOS as far as possible. Add a simple runner or helper script if it makes the process easier, so I can choose input, output, work folder, forcing type, and site or group name without remembering a long command.

Also add a clear quick start note for non experts that explains how to build, test, set the path, prepare expected input folders, and run a small example. Look up current ECMWF docs online if you need to.