WSI malaria comparison v0.1

Run: python3 malaria_model.py
Requires Python 3 standard library only. No network requests.

The script prints both program calculations using the shared malaria profiles.
Source inputs, cell references and exclusions are in opportunities/.
Costs are full modeled delivery costs. These are core program benchmarks,
not verified current marginal-donation estimates. Program costs and outcomes
come from different source periods and target populations. Ages 5+ omitted.
Central, lower and higher illness courses are provisional USU judgments.
A fatal course replaces an ordinary course for each direct death prevented.
Mapping scenarios are not confidence intervals or full uncertainty bounds.

To explore a different profile, make a new version and update both the shared
profile file and the original Chad snapshot assertion explicitly. Preserve
old files to reproduce published estimates.
