Read it top to bottom. The top and bottom strata are already yours and do not change. Only the middle one is new, and it is the part you would otherwise have to build with a bench you cannot hire.
your tools · unchanged
one interface · any model
the layer · the only new thing
self-hosted · model and harness agnostic
roles and tenancy
audit on every call
build scan
egress proxy
kill switch
your systems · unchanged
connected, not replaced · nothing migrates
Engineering wires the middle stratum in once. Everyone else works in the top one. Swap anything above or below. The middle stays.