Enhancement: provide prediction request geometry for lfmc

The workflow documented on the readme fails with
```
{"timestamp": "2026-01-06T16:56:20.733476+00:00", "severity": "ERROR", "message": "Required project file /home/rce/olmoearth_projects/olmoearth_run_data/lfmc/prediction_request_geometry.geojson does not exist.", "logger": "olmoearth_run.runner.local.predict_runner", "thread": 123299566874752, "module": "predict_runner", "function": "_setup_project_env", "line": 95, "taskName": null}
```
I understand the intent is for the user to create this, however providing a sample with an interesting result would be a nice enhancement