...bleiben, werden spätere Häufigkeiten/Cluster wertlos.

### Fix (minimal, sauber)
Erweitere `STOPWORDS` um gängige deutsche Funktionswörter. Ergänze im Script:

```python
STOPWORDS |= {
    "sondern","vielleicht","momentan","einfach","wirklich","gerade","halt","eben",
    "also","naja","doch","trotzdem","deshalb","daher","darum","wobei","während",
    "mehr","weniger","sehr","ganz","bisschen","teilweise","ir...