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-10-lesson-1.module

@@ -7,37 +7,37 @@ VOICE_DEFAULT: aoede | Clear, friendly American English narrator
 VOICE_INTRO: aoede | Warm, lightly witty teacher voice
 VOICE_PROMPT: gacrux | Questions and cues, read clearly
 VOICE_RESPONSE: schedar | Model answers, warm and clear
-VOICE: Frank | achernar | Male
+VOICE: Frank | charon | Male
 VOICE: Tina | gacrux | Female
-VOICE: Carl | achird | Male
-VOICE: Dora | schedar | Female
-VOICE: Man | achernar | Male
+VOICE: Carl | umbriel | Male
+VOICE: Dora | kore | Female
+VOICE: Man | achird | Male
 VOICE: Woman | gacrux | Female
 VOICE: Peggy | gacrux | Female
-VOICE: Peter | achernar | Male
+VOICE: Peter | zubenelgenubi | Male
 VOICE: Hank | achird | Male
-VOICE: Pete | schedar | Male
-VOICE: Eric | achernar | Male
+VOICE: Pete | alnilam | Male
+VOICE: Eric | achird | Male
 VOICE: Adam | schedar | Male
-VOICE: Brad | achird | Male
+VOICE: Brad | alnilam | Male
 VOICE: Dave | schedar | Male
-VOICE: Fred | achird | Male
-VOICE: Greg | achernar | Male
-VOICE: Stan | achird | Male
+VOICE: Fred | umbriel | Male
+VOICE: Greg | achird | Male
+VOICE: Stan | iapetus | Male
 VOICE: Lynn | aoede | Female
-VOICE: Mark | achernar | Male
+VOICE: Mark | achird | Male
 VOICE: Cashier | gacrux | Female
-VOICE: Rick | achernar | Male
-VOICE: Ali | achird | Male
-VOICE: Ann | aoede | Female
-VOICE: Chris | achernar | Male
-VOICE: George | achernar | Male
-VOICE: Chuck | achird | Male
-VOICE: Ed | achernar | Male
-VOICE: Larry | achernar | Male
-VOICE: Jack | achird | Male
-VOICE: Bob | achernar | Male
-VOICE: Hal | achird | Male
+VOICE: Rick | achird | Male
+VOICE: Ali | schedar | Male
+VOICE: Ann | kore | Female
+VOICE: Chris | charon | Male
+VOICE: George | algenib | Male
+VOICE: Chuck | alnilam | Male
+VOICE: Ed | rasalgethi | Male
+VOICE: Larry | algieba | Male
+VOICE: Jack | puck | Male
+VOICE: Bob | achird | Male
+VOICE: Hal | charon | Male
 VOICE: ID | achernar | speaker (auto)
 VOICE: Narrator | achird | speaker (auto)