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-3-lesson-1.module

@@ -8,20 +8,20 @@ VOICE_DEFAULT: aoede | Clear, friendly American English narrator
 VOICE_INTRO: aoede | Warm, lightly wry teacher-narrator
 VOICE_PROMPT: gacrux | Questions and cues, read clearly
 VOICE_RESPONSE: schedar | Model answers, warm and clear
-VOICE: Jim | achernar | Male speaker
-VOICE: Bill | achird | Male speaker
-VOICE: Ted | schedar | Male speaker
-VOICE: Bob | gacrux | Male speaker
-VOICE: Tim | achernar | Male speaker
-VOICE: Joe | achird | Male speaker
-VOICE: Don | schedar | Male speaker
-VOICE: Ann | aoede | Female speaker
-VOICE: Pam | aoede | Female speaker
-VOICE: Ken | achernar | Male speaker
+VOICE: Jim | iapetus | Male speaker
+VOICE: Bill | charon | Male speaker
+VOICE: Ted | alnilam | Male speaker
+VOICE: Bob | achird | Male speaker
+VOICE: Tim | puck | Male speaker
+VOICE: Joe | zubenelgenubi | Male speaker
+VOICE: Don | umbriel | Male speaker
+VOICE: Ann | kore | Female speaker
+VOICE: Pam | achernar | Female speaker
+VOICE: Ken | orus | Male speaker
 VOICE: Linda | aoede | Female speaker
-VOICE: Betty | aoede | Female speaker
-VOICE: Tom | achird | Male speaker
-VOICE: Jack | schedar | Male speaker
+VOICE: Betty | gacrux | Female speaker
+VOICE: Tom | schedar | Male speaker
+VOICE: Jack | puck | Male speaker
 VOICE: ID | achernar | speaker (auto)
 
 $LESSON 1-1: Times of Day and Daily Routines