normalize marked memory subjects

modules/interaction/domain/personal_memory.go

@@ -151,9 +151,14 @@ func RecallPersonalPreference(history []interaction.HumanUtterance, question str
 
 func preferenceSubject(preference string) string {
 	if separator := strings.Index(preference, "—"); separator >= 0 {
-		return strings.TrimSpace(preference[:separator])
+		preference = preference[:separator]
 	}
-	return strings.TrimSpace(preference)
+	subject := strings.TrimSpace(preference)
+	// Operational markers belong to the preference value, not a new subject.
+	if strings.HasPrefix(strings.ToLower(subject), "тестовый цвет") {
+		return "тестовый цвет"
+	}
+	return subject
 }
 
 func personalCurrentLocation(message string) string {

modules/interaction/domain/personal_memory_test.go

@@ -62,3 +62,17 @@ func TestCompilePersonalMemoryRanksCurrentSubjectWithoutDroppingHistory(t *testi
 		t.Fatalf("historical evidence was dropped: %+v", memory.Facts)
 	}
 }
+
+func TestCompilePersonalMemoryNormalizesOperationalSubjectMarker(t *testing.T) {
+	memory := CompilePersonalMemory([]interaction.HumanUtterance{
+		{ID: "old", Content: "запомни: мой тестовый цвет — фиолетовый", ReceivedAtUnixMillis: 100},
+		{ID: "new", Content: "запомни: мой тестовый цвет M5 — лазурный", ReceivedAtUnixMillis: 200},
+	})
+	current, ok := memory.LatestPreference("тестовый цвет")
+	if !ok || current.SourceUtteranceID != "new" || !strings.Contains(current.Value, "лазурный") {
+		t.Fatalf("expected newest marked preference, got %+v, ok=%t", current, ok)
+	}
+	if len(memory.Facts) != 2 {
+		t.Fatalf("expected historical fact retention, got %d facts", len(memory.Facts))
+	}
+}