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

audit/internal/app/component_status_db.go

@@ -125,6 +125,55 @@ func lastEntryFromSource(history []ComponentStatusEntry, source string) *Compone
 	return nil
 }
 
+// recomputeIgnoringSources retires obsolete producers from the current
+// component verdict without deleting their audit history. It selects the
+// highest-severity latest observation from every remaining source.
+func (db *ComponentStatusDB) recomputeIgnoringSources(key string, sources ...string) {
+	if db == nil {
+		return
+	}
+	ignored := make(map[string]struct{}, len(sources))
+	for _, source := range sources {
+		ignored[source] = struct{}{}
+	}
+
+	db.mu.Lock()
+	defer db.mu.Unlock()
+	db.reloadLocked()
+	rec := db.records[key]
+	if rec == nil {
+		return
+	}
+
+	latest := make(map[string]ComponentStatusEntry)
+	for i := len(rec.History) - 1; i >= 0; i-- {
+		entry := rec.History[i]
+		if _, skip := ignored[entry.Source]; skip {
+			continue
+		}
+		if _, seen := latest[entry.Source]; !seen {
+			latest[entry.Source] = entry
+		}
+	}
+	var winner *ComponentStatusEntry
+	for _, entry := range latest {
+		candidate := entry
+		if winner == nil || componentSeverity(candidate.Status) > componentSeverity(winner.Status) ||
+			(componentSeverity(candidate.Status) == componentSeverity(winner.Status) && candidate.At.After(winner.At)) {
+			winner = &candidate
+		}
+	}
+	if winner == nil {
+		return
+	}
+	if rec.Status != winner.Status || rec.ErrorSummary != winner.Detail {
+		rec.LastChangedAt = time.Now().UTC()
+	}
+	rec.Status = winner.Status
+	rec.ErrorSummary = winner.Detail
+	_ = db.saveLocked()
+}
+
 // Get returns the current record for a component key.
 func (db *ComponentStatusDB) Get(key string) (ComponentStatusRecord, bool) {
 	if db == nil {
@@ -258,32 +307,13 @@ func ApplySATResultToDB(db *ComponentStatusDB, target, archivePath string) {
 	// otherwise fails to match any real BDF.
 	switch target {
 	case "nvidia", "nvidia-targeted-stress", "nvidia-compute", "nvidia-targeted-power", "nvidia-pulse",
-		"nvidia-interconnect", "nvidia-bandwidth", "nvidia-stress", "nvidia-config", "nvidia-pcie-bandwidth":
+		"nvidia-interconnect", "nvidia-bandwidth", "nvidia-stress", "nvidia-config":
 		db.Record("pcie:gpu:nvidia", source, dbStatus, detail)
+		if target == "nvidia-bandwidth" {
+			db.recomputeIgnoringSources("pcie:gpu:nvidia", "sat:pcie-link", "sat:nvidia-pcie-bandwidth")
+		}
 	case "amd", "amd-stress", "amd-mem", "amd-bandwidth":
 		db.Record("pcie:gpu:amd", source, dbStatus, detail)
-	case "pcie-link":
-		// Forced-retrain PCIe link check (audit/internal/platform/pcie_link_check.go):
-		// the only verified (non-idle-sampled) source for PCIe link-speed
-		// status. summary.txt carries up to three independent sub-verdicts
-		// — record each into its own component key rather than collapsing
-		// them into one, since a degraded NIC/HBA shouldn't be reported as
-		// a GPU fault or vice versa.
-		recordPCIeLinkSubStatus := func(key, kvKey string) {
-			v, ok := kv[kvKey]
-			if !ok {
-				return
-			}
-			st := strings.ToUpper(strings.TrimSpace(v))
-			d := "pcie-link SAT: " + st
-			if st != "OK" && kv["warnings"] != "" {
-				d += " — " + kv["warnings"]
-			}
-			db.Record(key, source, satStatusToDBStatus(st), d)
-		}
-		recordPCIeLinkSubStatus("pcie:gpu:nvidia", "gpu_nvidia_status")
-		recordPCIeLinkSubStatus("pcie:gpu:amd", "gpu_amd_status")
-		recordPCIeLinkSubStatus("pcie:link:other", "other_status")
 	case "memory", "memory-stress", "sat-stress":
 		db.Record("memory:all", source, dbStatus, detail)
 	case "cpu", "platform-stress":