fix(pcie): verify GPU links under real bandwidth load

audit/internal/app/component_status_db_test.go

@@ -75,6 +75,46 @@ func TestApplySATResultToDBNormalizesGPUKeyByVendor(t *testing.T) {
 	}
 }
 
+func TestNvidiaBandwidthRetiresForcedRetrainWarning(t *testing.T) {
+	db, err := OpenComponentStatusDB(filepath.Join(t.TempDir(), "component-status.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	db.Record("pcie:gpu:nvidia", "sat:pcie-link", "Warning", "idle forced retrain stayed at Gen1")
+
+	ApplySATResultToDB(db, "nvidia-bandwidth", writeSATSummary(t, "OK"))
+
+	rec, ok := db.Get("pcie:gpu:nvidia")
+	if !ok {
+		t.Fatal("expected pcie:gpu:nvidia record")
+	}
+	if rec.Status != "OK" {
+		t.Fatalf("status=%q want OK after real-traffic check supersedes forced retrain", rec.Status)
+	}
+	if lastEntryFromSource(rec.History, "sat:pcie-link") == nil {
+		t.Fatal("retired forced-retrain observation must remain in audit history")
+	}
+}
+
+func TestNvidiaBandwidthDoesNotClearIndependentGPUWarning(t *testing.T) {
+	db, err := OpenComponentStatusDB(filepath.Join(t.TempDir(), "component-status.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	db.Record("pcie:gpu:nvidia", "sat:pcie-link", "Warning", "idle forced retrain stayed at Gen1")
+	db.Record("pcie:gpu:nvidia", "sat:nvidia-config", "Warning", "NVLink error counters are non-zero")
+
+	ApplySATResultToDB(db, "nvidia-bandwidth", writeSATSummary(t, "OK"))
+
+	rec, ok := db.Get("pcie:gpu:nvidia")
+	if !ok {
+		t.Fatal("expected pcie:gpu:nvidia record")
+	}
+	if rec.Status != "Warning" || !strings.Contains(rec.ErrorSummary, "NVLink") {
+		t.Fatalf("record=%+v want independent nvidia-config Warning to survive", rec)
+	}
+}
+
 func TestApplyComponentStatusDBMatchesGPUByVendor(t *testing.T) {
 	db, err := OpenComponentStatusDB(filepath.Join(t.TempDir(), "component-status.json"))
 	if err != nil {