A definition names no installation: the check, an operator's value, a context on the git seat

InstallationProblems judges every value the mesh acts on for a name under a public top-level domain
or a public address, with prose, the world's registries, resolvers and certificate authorities
exempt, and a name a resource means on purpose declared with its reason (names-on-purpose). Run by
module check and a catalogue-wide test, not yet at registration, while the declared list shrinks.
${setting:<key>} fills a file from the assignment's settings and is refused when nothing set it.
A build context may live on the git seat; the request carries the seat's clone base (novox/hq ADR
0112, ADR 0155, issues 122 and 134).

internal/catalogue/declaration.go

@@ -696,6 +696,13 @@ func (r Resolution) compose(with Rendering, owner map[string]string) ([]map[stri
 			// Said in the catalogue, not on the machine: the host parses strictly and knows no
 			// such field, and the reason is for a reader of the manifest.
 			delete(copied, SecretsInEnvironment)
+			delete(copied, NamesOnPurpose)
+			// **An operator's value, from the assignment** (novox/hq ADR 0112, ADR 0155): what a
+			// definition may not carry because it is true of one installation only. Filled from
+			// the same layers a mergeable file takes, and refused when no layer set it.
+			if err := settingInto(copied, with.Settings[m.Module], m.Module); err != nil {
+				return nil, err
+			}
 			// **Placed before anything reads a path.** A pathless directory receives the path
 			// this node resolves for it, and every ${dir:…} — in paths, mounts, content and
 			// environment — becomes that path, so what follows sees only concrete places