Standardize Data Mapping and Transformation

Implement standardized data mapping, transformation, and normalization processes to ensure consistency and accuracy when integrating data from multiple sources.

Stories:
- [ ] #89
- [ ] #90
- [ ] #91

Start by reading the child stories referenced as #89, #90, and #91, since this issue does not identify files, entry points, or tests. Use those stories to determine the concrete mapping, transformation, and normalization work across the multiple data sources; done means the resulting processes are standardized and produce consistent, accurate data.

Written by the indexing model from the issue text.