Add Hirashiba CT2 model options

sync V9 teacher-student con variant from qt2 b15068a

sync V9 embedded classical and relation roles from qt2 467c02a

sync V9 teacher-student dialogue role fix from qt2 3597738

sync V9 teacher/mother object guards from qt2 5585b77

sync V9 no-speech teacher-object guard from qt2 e8eee55

sync V9 teacher-object guard from qt2 21ab81a