This function formats raw MetaRVM simulation output by:
Converting time steps to calendar dates
Adding demographic attributes from population mapping
Handling different disease states appropriately:
Regular states (S, E, I, etc.): Keep values at integer time points
New count states (n_ prefix): Sum pairs to get daily counts
format_metarvm_output(sim_output, config)data.table with formatted output including calendar dates and demographics
data.table containing raw simulation output from meta_sim
MetaRVMConfig object or config list containing parameters