fix cost calculations to match script

[whoabuddy]

We have some functionality that changed when we switched to OpenRouter, but the test script has a functioning cost calculation function that we can take and apply to the original flow so we populate the info in the DB.

[biwasxyz]

This repository has been retired and will be archived soon. The hosted agent infrastructure has been superseded. If this issue is still relevant, please open a new issue in the appropriate active repo.