A constitution is written and codifies the process for making ratifying and enforcing laws. That then is the common standard for some subset of behaviors as defined by the constitution which defines who it does and does not apply to. Different constitutions outline different processes but the structure of the “Rule of Law” is the same.
This is in contrast to other structures like pure monarchies (unlike constitutional monarchies) which have a “divine” process for defining the structure of the governed land.
What you seem to want is for civil law to be subordinated in favor of common law, but that simply kicks the can and doesn’t actuall solve the problem.
What’s actually happening right now is that society at large is questioning the foundational assumptions of society. To Wit this is a perfect example of effectively questioning the foundational function of governance in the post World War II world while also not being aware of it apparently.