SIE.1:9 - Consequences

The contract limits source fan-out, makes semantic loss and authority visible, and gives implementation and validation a shared target. It can stop an integration before expensive model or platform work. It also makes conflicts and narrow usable subsets publishable outcomes.

The cost is early negotiation about the receiver, evidence, loss, and stop conditions. Some attractive future reuse remains outside the first package and must earn its own contract or compatible extension.