Cost-engineer an agent pipeline

This project turns the course into one artefact you could actually use: a cost model, a set of optimisations each justified by a measured saving and a quality check, and the ledger and controls that keep spend visible afterwards. It runs on synthetic matters and your Claude subscription, so no client data and no API bill are needed. By the end you should be able to put a defensible number on "what does a matter cost us?", say which levers moved it and by how much, and show that quality didn't fall.