R3-1, R3-2, R3-3: the node-engine reads no build of the builder; the shadow builds from the entry it holds

The composer's Build is made from the catalog half's entry it holds and the parts of the want that names it (buildOf); the
inputs of the indexer's modules and the builder's builds, takeBuildDone, takeModule and the builder read are gone, and mesh-host
names no BuilderBuildsBucket. The shadow takes the entries of the builds it composes from (askBuildsEntries), builds a module a
candidate adds from its entry and the candidate's `added` parts (A-316), and holds, with the reason, a module whose entry
has no part given, whose fingerprint the verb module does not give, or for which it errors (A-312). Its composer is given the
entry call as the node's own is. Rows: a built module added with and without parts, the verb module answering no fingerprint
and erroring.

Builds: design 47 G §421, §628, A-308, A-312, A-316

internal/compose/frombus/frombus.go

@@ -81,7 +81,7 @@ type Reader interface {
 	// and each it grants as a provider, with the copy sealed to it (the vault's `own` with the keys, ADR 0550 §5). A key
 	// the vault holds no value for is left out; the composition then stands in for it, and Compose refuses it.
 	Credentials(ctx context.Context, node string, asConsumer, asProvider []compose.CredentialKey) ([]compose.Credential, []compose.Issued, error)
-	// Build is a module's build at a fingerprint, the builder's key (builds.BuilderBuildsBucket, BuilderBuildKey); nil
+	// Build is a module's build at a fingerprint, the builder's key (BuilderBuildKey); nil
 	// when the builder holds none. The composing node composes each of its modules from its build (issue 1126).
 	Build(ctx context.Context, module, fp string) (*builds.BuilderBuild, error)
 	// Archive is the archive at url, a kept reference routed to the artifact store as the composing node reaches it