household income

reuse definition from OMRSE; discuss imports

Decision was reached at BCIO-OMRSE co-devo meeting, Dec 10, 2025. See [APRICOT issue](https://liveuclac.sharepoint.com/sites/APRICOTTeamHub/Lists/Issue%20tracker/DispForm.aspx?ID=255&e=WnjcVN).

Consider review of BCIO for other financial terms, as OMRSE appears to have a greater investment to-date in defining financial entities.