Fix Gemini voice genders in books 9-12 (achernar is a female voice)

Male-described speakers were mapped to the female voice achernar (and a few
females to schedar) — 210 VOICE swaps across the four regenerated books.
Also: book-11 'Two Letters' now labeled Jane:/Ann: with female voices
instead of one Narrator (Yana's report), and junk auto-declared 'VOICE: ID'
lines dropped.

Co-authored-by: Cursor <cursoragent@cursor.com>

book-9-lesson-4.module

@@ -7,43 +7,42 @@ HOME_LANG_G: en
 VOICE_DEFAULT: aoede | Clear, friendly American English narrator
 VOICE_PROMPT: gacrux | For stimulus/prompt audio
 VOICE_RESPONSE: schedar | Model answers, warm and clear
-VOICE: Alex | achernar | Male
+VOICE: Alex | charon | Male
 VOICE: Rita | gacrux | Female
 VOICE: Man | achird | Male
 VOICE: Lady | gacrux | Female
-VOICE: Jimmy | achernar | Male speaker
+VOICE: Jimmy | achird | Male speaker
 VOICE: Freddy | achird | Male speaker
-VOICE: Customer | achernar | Male speaker
+VOICE: Customer | achird | Male speaker
 VOICE: Waiter | achird | Male speaker
-VOICE: Chuck | achernar | Male speaker
+VOICE: Chuck | achird | Male speaker
 VOICE: Tony | achird | Male speaker
-VOICE: Dan | achernar | Male speaker
+VOICE: Dan | achird | Male speaker
 VOICE: Tom | achird | Male speaker
 VOICE: Sam | schedar | Male speaker
-VOICE: Jim | achernar | Male speaker
+VOICE: Jim | schedar | Male speaker
 VOICE: Don | achird | Male speaker
 VOICE: Kim | aoede | Female speaker
-VOICE: Pat | schedar | Female speaker
+VOICE: Pat | aoede | Female speaker
 VOICE: Sue | aoede | Female speaker
 VOICE: Bob | achird | Male speaker
-VOICE: Tim | achernar | Male speaker
+VOICE: Tim | charon | Male speaker
 VOICE: Pam | aoede | Female speaker
 VOICE: Ann | aoede | Female speaker
 VOICE: Kevin | achird | Male speaker
 VOICE: Linda | aoede | Female speaker
-VOICE: Alan | achernar | Male speaker
+VOICE: Alan | achird | Male speaker
 VOICE: Paul | achird | Male speaker
-VOICE: Mike | achernar | Male speaker
+VOICE: Mike | schedar | Male speaker
 VOICE: Sara | aoede | Female speaker
 VOICE: Bill | achird | Male speaker
-VOICE: Jeff | achernar | Male speaker
+VOICE: Jeff | charon | Male speaker
 VOICE: Lori | aoede | Female speaker
 VOICE: Waitress | aoede | Female speaker
-VOICE: Mr_Allen | achernar | Male speaker
+VOICE: Mr_Allen | achird | Male speaker
 VOICE: Mr_Simms | achird | Male speaker
-VOICE: Mr_Rogers | achernar | Male speaker
+VOICE: Mr_Rogers | charon | Male speaker
 VOICE: Carla | aoede | Female speaker
-VOICE: ID | achernar | speaker (auto)
 VOICE: Narrator | achird | speaker (auto)
 
 $SESSION 4-1: Running Out of Gas