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-7-lesson-1.module

@@ -7,27 +7,27 @@ 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: John | achernar | Male student
-VOICE: Al | achird | Male student
+VOICE: John | orus | Male student
+VOICE: Al | charon | Male student
 VOICE: Mrs_Murphy | gacrux | Female teacher
-VOICE: Anna | aoede | Female student
-VOICE: Officer | achernar | Male officer
+VOICE: Anna | leda | Female student
+VOICE: Officer | achird | Male officer
 VOICE: Sergeant | schedar | Male sergeant
-VOICE: Carl | achird | Male
-VOICE: Colonel | achernar | Male officer
+VOICE: Carl | umbriel | Male
+VOICE: Colonel | achird | Male officer
 VOICE: Susan | gacrux | Female student
 VOICE: Karen | aoede | Female student
 VOICE: Linda | aoede | Female student
-VOICE: Jim | achernar | Male student
-VOICE: Mary | aoede | Female student
+VOICE: Jim | iapetus | Male student
+VOICE: Mary | achernar | Female student
 VOICE: Sue | aoede | Female student
-VOICE: Dan | achernar | Male student
+VOICE: Dan | orus | Male student
 VOICE: Bob | achird | Male student
-VOICE: Mark | achernar | Male student
-VOICE: Kent | achird | Male student
-VOICE: Steve | achernar | Male student
-VOICE: David | achird | Male student
-VOICE: Tom | achernar | Male student
+VOICE: Mark | achird | Male student
+VOICE: Kent | charon | Male student
+VOICE: Steve | iapetus | Male student
+VOICE: David | alnilam | Male student
+VOICE: Tom | schedar | Male student
 VOICE: ID | achernar | speaker (auto)
 
 $LESSON 1-1: Meeting People and Jobs