Wire load lifecycle through input acquisition

internal/engine/acquisition.go

@@ -169,6 +169,7 @@ func acquireInput(request inputAcquisitionRequest, policy acquisitionPolicy, sta
 			versionState.mainProcessing = &processed
 		}
 	}
+	request.input.source = selectedSource
 	if request.input.imports && selectedSource.kind != sourceNone {
 		importRequest := importAcquisitionRequest{input: request, main: parsed, processing: versionProcessing}
 		input.composition, input.sources, diagnostics = acquireImportedInput(importRequest, &policy, state, tier)
@@ -233,3 +234,21 @@ func acquireInput(request inputAcquisitionRequest, policy acquisitionPolicy, sta
 	}
 	return input, nil
 }
+
+func registerAcquiredSource(source Source, context *FilesystemContext, info *SourceInfo, visited map[resourceIdentity]importRoute, hostToken *namespaceToken) *Diagnostic {
+	if visited == nil || info == nil || info.Path == "" {
+		return nil
+	}
+	identity := resourceIdentity{namespace: hostToken, path: info.Path}
+	if source.kind == sourceFilesystem {
+		identity.namespace = source.namespace.token
+	} else if context != nil && context.FS != nil {
+		identity.namespace = context.FS.namespace.token
+	}
+	if previous, repeated := visited[identity]; repeated {
+		value := importRepeatedDiagnostic(Location{SourceID: info.ID}, previous, importRoute{})
+		return &value
+	}
+	visited[identity] = importRoute{canonical: info.Path}
+	return nil
+}