Delete merge-check.sh; the checker's levels run what it ran (issue 1295, S3; ADR 0529)

cmd/mesh-host/no_check_script_test.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// The checker runs gofmt, go vet and both test levels by Go's convention, and the build module starts the bus the
+// integration level needs (novox/hq ADR 0529): no script of the repository's own runs beside them.
+func TestTheRepositoryHoldsNoCheckScript(t *testing.T) {
+	if _, err := os.Stat(filepath.Join("..", "..", "merge-check.sh")); err == nil {
+		t.Fatal("merge-check.sh is back: the checker's levels run the tests")
+	}
+}

cmd/mesh-host/vaultbox_nats_test.go

@@ -3,7 +3,7 @@ package main
 // Issue 755's proof on a real bus (novox/hq ADR 0349 §16): a core credential the vault sealed to this machine crosses
 // the bus inside the declaration, which the controller carries and cannot open, and this engine opens it with its
 // sealing key and writes the value. A listener on every subject keeps every byte that crossed; the value is never
-// among them. Run against the throwaway bus merge-check.sh starts (MESH_TEST_NATS).
+// among them. Run against the throwaway bus the build module starts for the integration level (MESH_TEST_NATS).
 
 import (
 	"context"