An emotion-aware interface can observe a great deal. That does not mean it should. The first design decision is not which model to use, but which human signals genuinely help the interaction.
With reSilence, the mirror was designed as a prompt for reflection rather than an authority on how somebody feels. Its interpretation stays visible, imperfect, and open to correction.
Confidence, ambiguity, and consent become interface materials—not details to hide behind a polished prediction.