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-8-lesson-3.module

@@ -9,35 +9,35 @@ VOICE_INTRO: aoede | Warm, slightly wry teacher voice
 VOICE_PROMPT: gacrux | Questions and cues, read clearly
 VOICE_RESPONSE: schedar | Model answers, warm and clear
 VOICE: Narrator | aoede | Neutral narrator
-VOICE: Ali | achernar | Male student
+VOICE: Ali | schedar | Male student
 VOICE: Bob | achird | Male
 VOICE: Operator | gacrux | Female telephone operator
-VOICE: Man | achernar | Young man
-VOICE: Tony | achernar | Male
+VOICE: Man | achird | Young man
+VOICE: Tony | umbriel | Male
 VOICE: Juan | achird | Male
 VOICE: Karen | aoede | Female
-VOICE: Kathy | schedar | Female
-VOICE: Frank | achernar | Male
-VOICE: Harry | achird | Male
-VOICE: Carol | aoede | Female
-VOICE: Sam | achernar | Male
-VOICE: Linda | schedar | Female
-VOICE: Pvt_Moore | achernar | Male
-VOICE: Pvt_King | achird | Male
-VOICE: Sandra | aoede | Female
-VOICE: David | achernar | Male
-VOICE: Jeff | achernar | Male
+VOICE: Kathy | leda | Female
+VOICE: Frank | charon | Male
+VOICE: Harry | puck | Male
+VOICE: Carol | kore | Female
+VOICE: Sam | charon | Male
+VOICE: Linda | aoede | Female
+VOICE: Pvt_Moore | orus | Male
+VOICE: Pvt_King | iapetus | Male
+VOICE: Sandra | achernar | Female
+VOICE: David | alnilam | Male
+VOICE: Jeff | orus | Male
 VOICE: Gary | achird | Male
-VOICE: Larry | achernar | Male
-VOICE: Terry | achird | Male
-VOICE: Pvt_Jones | achernar | Male
-VOICE: Sgt_Cline | achird | Male
-VOICE: Ralph | achernar | Male
-VOICE: Herb | achird | Male
+VOICE: Larry | algieba | Male
+VOICE: Terry | schedar | Male
+VOICE: Pvt_Jones | achird | Male
+VOICE: Sgt_Cline | charon | Male
+VOICE: Ralph | alnilam | Male
+VOICE: Herb | orus | Male
 VOICE: Sandy | aoede | Female
-VOICE: Jim | achernar | Male
-VOICE: Elaine | schedar | Female
-VOICE: Susan | aoede | Female
+VOICE: Jim | iapetus | Male
+VOICE: Elaine | achernar | Female
+VOICE: Susan | gacrux | Female
 VOICE: ID | achernar | speaker (auto)
 
 $LESSON 3-1: Making a Phone Call