What research is there on how people go from examining/gathering evidence to executing on a decision?
It's possible that there is no sharp threshold between information gathering and acting. A recent paper by Piantadosi exploring that possibility, and citing a ton of (admittedly more conventional/mainstream) work on decision boundaries is:

Alonso-Diaz S, Cantlon JF, Piantadosi ST (2018) A threshold-free model of numerosity comparisons. PLoS ONE 13(4): e0195188. doi: 10.1371/journal.pone.0195188