View Package

A Package whose purpose is to publish a single, stable, addressable View. Its `rootView` names the one View instance the package exists to carry; other resources in the package are that View's supporting parts (Projections, predicate expressions). Because it is an ordinary versioned Package, a ViewPackage is referenced by URI like any other — this is how an agent names a query to run, or a publisher ships a reusable shape, without inlining the View at every call site.