V02 — no release by mere possession. A package this machine built may
leave it; a package it received may be passed on (export, send, publish)
only when its author granted that in the manifest (redistributable: true) and the full manifest signature covers the grant. An absent grant,
or one an identity-only signature leaves open to edits, is no grant.
Apply an admitted package to the project’s stores (knowledge, graph,
patterns, gotchas, session). The type is the gate: an AdmittedPackage
exists only for content that passed the current admission unchanged.