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-2.module

@@ -8,33 +8,33 @@ VOICE_DEFAULT: aoede | Clear, friendly American English narrator
 VOICE_INTRO: aoede | Warm, friendly teacher voice
 VOICE_PROMPT: gacrux | Questions and cues, read clearly
 VOICE_RESPONSE: schedar | Model answers, warm and clear
-VOICE: Frank | achernar | Male voice
+VOICE: Frank | charon | Male voice
 VOICE: Doris | gacrux | Female voice
-VOICE: Steve | achernar | Male speaker
-VOICE: John | achird | Male speaker
-VOICE: Don | schedar | Male speaker
-VOICE: Captain_James | achernar | Male speaker
-VOICE: Major_Stans | achird | Male speaker
+VOICE: Steve | iapetus | Male speaker
+VOICE: John | orus | Male speaker
+VOICE: Don | umbriel | Male speaker
+VOICE: Captain_James | achird | Male speaker
+VOICE: Major_Stans | charon | Male speaker
 VOICE: Captain_Gray | schedar | Male speaker
 VOICE: Dorothy | aoede | Female speaker
-VOICE: Chris | gacrux | Male speaker
-VOICE: Tony_White | achernar | Male speaker
+VOICE: Chris | charon | Male speaker
+VOICE: Tony_White | achird | Male speaker
 VOICE: Travel_Agent | aoede | Female speaker
-VOICE: David | achernar
+VOICE: David | alnilam
 VOICE: Jane | aoede
-VOICE: Jeff | achird
-VOICE: Mrs_Smith | aoede
-VOICE: Mrs_Barr | aoede
+VOICE: Jeff | orus
+VOICE: Mrs_Smith | achernar
+VOICE: Mrs_Barr | achernar
 VOICE: Dr_Rivers | achernar
 VOICE: Miss_Ash | aoede
-VOICE: Mr_West | achird
-VOICE: Mr_Farr | schedar
-VOICE: Tommy | gacrux
-VOICE: Col_Green | achernar
-VOICE: Sgt_Stacy | achird
-VOICE: Gen_Briggs | schedar
-VOICE: Capt_Barber | achernar
-VOICE: Col_Flowers | achird
+VOICE: Mr_West | charon
+VOICE: Mr_Farr | achird
+VOICE: Tommy | schedar
+VOICE: Col_Green | iapetus
+VOICE: Sgt_Stacy | orus
+VOICE: Gen_Briggs | alnilam
+VOICE: Capt_Barber | achird
+VOICE: Col_Flowers | charon
 VOICE: Capt_Prince | schedar
 VOICE: ID | achernar | speaker (auto)
 VOICE: Narrator | achird | speaker (auto)