Add explicit pipeline configuration imports

internal/config/composition_test.go

@@ -1,8 +1,6 @@
 package config
 
 import (
-	"os"
-	"path/filepath"
 	"reflect"
 	"strings"
 	"testing"
@@ -165,6 +163,20 @@ func TestMergeAdditiveCompositionReportsAllClaimingSources(t *testing.T) {
 			t.Fatalf("error = %q, want %q", err, want)
 		}
 	}
+
+	_, err = mergeAdditiveCompositions(
+		mustParseComposition(t, "first.yml", "value: 1\n"),
+		mustParseComposition(t, "second.yml", "value: 2\n"),
+		mustParseComposition(t, "third.yml", "value: 3\n"),
+	)
+	if err == nil {
+		t.Fatal("mergeAdditiveCompositions() error = nil")
+	}
+	for _, want := range []string{"value", "first.yml", "second.yml", "third.yml"} {
+		if !strings.Contains(err.Error(), want) {
+			t.Fatalf("error = %q, want %q", err, want)
+		}
+	}
 }
 
 func TestMergeOverlayCompositionRecursesMapsAndReplacesAtomicValues(t *testing.T) {
@@ -307,21 +319,6 @@ zeta: 1
 	}
 }
 
-func TestPipelineCompositionEnvelopeIsNotPublicYet(t *testing.T) {
-	path := filepath.Join(t.TempDir(), "pipeline.yml")
-	if err := os.WriteFile(path, []byte(`composition:
-  imports: []
-whisperx:
-  transcribe_url: https://transcription.example.com/transcribe
-`), 0o644); err != nil {
-		t.Fatal(err)
-	}
-	_, err := LoadPipeline(path)
-	if err == nil || !strings.Contains(err.Error(), "field composition not found") {
-		t.Fatalf("LoadPipeline() error = %v, want strict public-schema rejection", err)
-	}
-}
-
 func mustParseComposition(t *testing.T, source, input string) *compositionDocument {
 	t.Helper()
 	document, err := parseCompositionBytes(source, []byte(input))