fix: complete hardware collection diagnostics

audit/internal/collector/psu_sdr_test.go

@@ -1,6 +1,9 @@
 package collector
 
-import "testing"
+import (
+	"bee/audit/internal/schema"
+	"testing"
+)
 
 func TestParsePSUSDR(t *testing.T) {
 	raw := `
@@ -118,3 +121,15 @@ func TestSynthesizePSUsFromSDR(t *testing.T) {
 		t.Fatalf("life used=%v", got[0].LifeUsedPct)
 	}
 }
+
+func TestMergePSUSDRAppendsPSUMissingFromFRU(t *testing.T) {
+	model := "PSU0"
+	slot := "0"
+	got := mergePSUSDR([]schema.HardwarePowerSupply{{Slot: &slot, Model: &model}}, map[int]psuSDR{
+		1: {slot: 1, status: statusOK},
+		2: {slot: 2, status: statusOK},
+	})
+	if len(got) != 2 || got[1].Slot == nil || *got[1].Slot != "1" {
+		t.Fatalf("PSUs=%#v, want FRU PSU0 plus synthesized PSU1", got)
+	}
+}