When an agency has promulgated regulations to give force to a constitutional provision rather than a statutory provision, what is the legal test for interpreting the regulations?

the relevant principles of interpretation differ when an agency has promulgated regulations to give force to a constitutional provision, rather than a statutory provision. The parties in this case have not suggested an alternative framework to interpret agency regulations authorized by constitutional provisions, and we see no reason to think a different framework would lead to a different result. Therefore, for purposes of this case we proceed as though the ordinary analytical approach applies. (Cf. Samara v. Matar (2018) 5 Cal.5th 322, 330, 234 Cal.Rptr.3d 446, 419 P.3d 924.)