additional explainer points

[smjenness]

• [ ] nsims in the R script versus array batches (total sims = ceiling(arrays/sims per batch))
• [ ] include renv::restore in core sim scripts
• [ ] estimation and simulation as separate scripts
• [ ] remove any local helpers like pkgload from HPC ready script
• [ ] number of jobs you can submit concurrently (versus number of epimodel partition nodes in cluster); concept of a queue