The facts write the suffix the control plane composed the names with, handed down rather than written twice (review of issue 079); the fixture is keyed as production keys it

internal/catalogue/declaration.go

@@ -92,6 +92,10 @@ type Rendering struct {
 	// mesh" resolves to. Passed in for the same reason grants are: who else is on the network is
 	// a fact about the mesh, and resolution answers questions about one machine.
 	Mesh []string
+	// Suffix is what a machine's internal name ends in, as the control plane composed Names —
+	// `internal` unless the operator chose another — so a fact writing those names does not
+	// compose it a second time.
+	Suffix string
 
 	// Kept is every operator-sealed secret in the mesh, for a module that `keeps` them. Nil when
 	// nothing on this node keeps them, or the mesh has no operator key.
@@ -524,7 +528,7 @@ func (r Resolution) Declaration(with Rendering) ([]map[string]any, error) {
 		// plane's; making a name resolve is the module's software. Emitted as ordinary files under
 		// this module's name, so they are applied, reported and removed exactly as anything else
 		// it declares.
-		given, err := FactsInto(m, r, with.Names)
+		given, err := FactsInto(m, r, with.Names, with.Suffix)
 		if err != nil {
 			return nil, err
 		}