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-10-lesson-1.module

@@ -8,39 +8,38 @@ VOICE_DEFAULT: aoede | Clear, friendly American English narrator
 VOICE_INTRO: aoede | Warm, lightly witty teacher voice
 VOICE_PROMPT: gacrux | Questions and cues, read clearly
 VOICE_RESPONSE: schedar | Model answers, warm and clear
-VOICE: Frank | achernar | Male
+VOICE: Frank | schedar | Male
 VOICE: Tina | gacrux | Female
 VOICE: Carl | achird | Male
-VOICE: Dora | schedar | Female
-VOICE: Man | achernar | Male
+VOICE: Dora | gacrux | Female
+VOICE: Man | achird | Male
 VOICE: Woman | gacrux | Female
 VOICE: Peggy | gacrux | Female
-VOICE: Peter | achernar | Male
+VOICE: Peter | achird | Male
 VOICE: Hank | achird | Male
 VOICE: Pete | schedar | Male
-VOICE: Eric | achernar | Male
+VOICE: Eric | schedar | Male
 VOICE: Adam | achird | Male
 VOICE: Brad | schedar | Male
 VOICE: Dave | achird | Male
 VOICE: Fred | schedar | Male
 VOICE: Madge | gacrux | Female
-VOICE: Greg | achernar | Male
+VOICE: Greg | achird | Male
 VOICE: Stan | achird | Male
 VOICE: Lynn | aoede | Female
-VOICE: Mark | achernar | Male
+VOICE: Mark | achird | Male
 VOICE: Cashier | gacrux | Female
-VOICE: Rick | achernar | Male
+VOICE: Rick | schedar | Male
 VOICE: Ali | achird | Male
 VOICE: Ann | aoede | Female
-VOICE: Chris | achernar | Male
-VOICE: George | achernar | Male
+VOICE: Chris | charon | Male
+VOICE: George | schedar | Male
 VOICE: Chuck | achird | Male
-VOICE: Ed | achernar | Male
-VOICE: Larry | achernar | Male
+VOICE: Ed | charon | Male
+VOICE: Larry | schedar | Male
 VOICE: Jack | achird | Male
-VOICE: Bob | achernar | Male
+VOICE: Bob | achird | Male
 VOICE: Hal | achird | Male
-VOICE: ID | achernar | speaker (auto)
 VOICE: Narrator | achird | speaker (auto)
 
 $SESSION 1-1: Vending Machines and Snacks