Agentic orchestration for residential construction, in pursuit of a Circular Economy. ML Systems (Rhode Island) runs seven AI agents and one human on an append-only house record, the Master Ledger: the record stores claims, not facts; every value carries its author and an evidence grade (measured › sensed › stated › record › modeled); a mind may claim, it may never ground; conflicts are quarantined, never averaged. Models are replaceable, the record is the asset. Interested in ontologies for construction task sequences, evidence-graded memory for agents, and the Language Modeler role: modeling the system in English and letting the model carry it into code. Public reference: github.com/MLSystemsRI/ml-systems-public