Take a module's fingerprint from the indexer when its commit has no build, and never compose a module its want names into the node's own (issue 1945)

A catalogue merge that leaves a module's sources alone registers it at the new
commit from the same done key, whose build record stands at its first commit,
so the commit had no build and the module no fingerprint of the new form: it
went into the node's own composition while its want named its own, and every
node declared its files twice. currentFingerprints now reads the indexer's
trunk value at the commit when no build points at it (1945/AC15), and a module
a want or have names by its own composition is left out of the node's own
(1945/AC16).

cmd/mesh-controller/composed_objects_test.go

@@ -26,7 +26,7 @@ func TestALargeFileOfACompositionHasItsObjectInTheBucket(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	comps, _, err := compositionsOf("novox", body, nil, nil, nil)
+	comps, _, _, err := compositionsOf("novox", body, nil, nil, nil, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -50,7 +50,7 @@ func TestACompositionNamingAnObjectTheBucketLacksIsRefused(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	comps, _, err := compositionsOf("novox", body, nil, nil, nil)
+	comps, _, _, err := compositionsOf("novox", body, nil, nil, nil, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -78,7 +78,7 @@ func TestEveryFilledFileStaysFilledInTheCompositions(t *testing.T) {
 		for _, m := range []string{"power", "claude-code", "node-env"} {
 			delete(fps, m)
 		}
-		comps, _, err := compositionsOf(node, body, fps, nil, nil)
+		comps, _, _, err := compositionsOf(node, body, fps, nil, nil, nil)
 		if err != nil {
 			t.Fatalf("%s: %v", node, err)
 		}