Both $rankFusion and $scoreFusion have a series of helper functions that create a stage, or list of stages, that become part of the total de-sugared query.

Audit the implementations of both these stages and place consistent function level comments that both:

• Show the JSON blob structure of the stage(s) each function creates
• Describe the conceptual purpose of adding such stage(s) to the de-sugared pipelin

We should do this near the every end of the project when nearly everything has settled (all logic and testing changes are in), so we can do a single final pass.