Update 8 - LowPowerMode + Bugfixes

internal/engine/article_research_cache_test.go

@@ -89,3 +89,21 @@ func TestLoadResearchEvidenceCanReuseInMemoryQueuedRecord(t *testing.T) {
 		t.Fatalf("unexpected cached evidence: %+v", loaded)
 	}
 }
+
+func TestMetadataStringTreatsMissingAndNilAsEmpty(t *testing.T) {
+	cases := []map[string]any{
+		nil,
+		{},
+		{"evidence_path": nil},
+		{"evidence_path": "<nil>"},
+		{"evidence_path": "null"},
+	}
+	for _, metadata := range cases {
+		if got := metadataString(metadata, "evidence_path"); got != "" {
+			t.Fatalf("expected empty metadata string, got %q from %#v", got, metadata)
+		}
+	}
+	if got := metadataString(map[string]any{"evidence_path": " research-evidence/x.json "}, "evidence_path"); got != "research-evidence/x.json" {
+		t.Fatalf("unexpected normalized metadata string %q", got)
+	}
+}