voice audit: gender-correct Gemini voices for all dialogue speakers (398/982 were mismatched, mostly female achernar on male roles); recurring characters keep one voice course-wide; distinct voices within dialogues

Co-authored-by: Cursor <cursoragent@cursor.com>

book-12-lesson-2.module

@@ -6,25 +6,25 @@ HOME_LANG_G: en
 VOICE_DEFAULT: aoede | Clear, friendly American English narrator
 VOICE_PROMPT: gacrux | Questions and cues, read clearly
 VOICE_RESPONSE: schedar | Model answers, warm and clear
-VOICE: Sam | achernar | Male student
-VOICE: Mark | schedar | Male student
-VOICE: Jack | achernar | Male speaker
-VOICE: Mike | schedar | Male speaker
-VOICE: Don | schedar | Male speaker
+VOICE: Sam | charon | Male student
+VOICE: Mark | achird | Male student
+VOICE: Jack | puck | Male speaker
+VOICE: Mike | algieba | Male speaker
+VOICE: Don | umbriel | Male speaker
 VOICE: Son | achird | Male
 VOICE: Mom | gacrux | Female
-VOICE: Glen | achernar | Male
-VOICE: Tony | schedar | Male
-VOICE: Dan | achernar | Male speaker
+VOICE: Glen | zubenelgenubi | Male
+VOICE: Tony | umbriel | Male
+VOICE: Dan | orus | Male speaker
 VOICE: Paula | aoede | Female speaker
-VOICE: Clerk | aoede | Female speaker
-VOICE: Maria | schedar | Female speaker
-VOICE: Steven | achernar | Male speaker
-VOICE: Waiter | achird | Male speaker
-VOICE: Tommy | achird | Young male speaker
+VOICE: Clerk | kore | Female speaker
+VOICE: Maria | callirrhoe | Female speaker
+VOICE: Steven | achird | Male speaker
+VOICE: Waiter | iapetus | Male speaker
+VOICE: Tommy | schedar | Young male speaker
 VOICE: Mother | aoede | Female speaker
-VOICE: Joe | achird | Male speaker
-VOICE: Tim | achernar | Male speaker
+VOICE: Joe | zubenelgenubi | Male speaker
+VOICE: Tim | puck | Male speaker
 VOICE: ID | achernar | speaker (auto)
 VOICE: Narrator | achird | speaker (auto)