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-12-lesson-1.module

@@ -6,45 +6,44 @@ 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: SpeakerA | achernar | Male voice
+VOICE: SpeakerA | achird | Male voice
 VOICE: SpeakerB | gacrux | Female voice
-VOICE: Spk1 | achernar | Male
+VOICE: Spk1 | schedar | Male
 VOICE: Spk2 | gacrux | Female
-VOICE: Roger | achernar | Male student
+VOICE: Roger | charon | Male student
 VOICE: Friend | schedar | Male student
-VOICE: Henry | achernar | Male
+VOICE: Henry | achird | Male
 VOICE: Pete | schedar | Male
 VOICE: Sarah | gacrux | Female
 VOICE: Colleague | achird | Male
 VOICE: Betty | aoede | Female speaker
 VOICE: Mary | aoede | Female speaker
-VOICE: Paul | achernar | Male speaker
+VOICE: Paul | schedar | Male speaker
 VOICE: Sam | achird | Male speaker
 VOICE: Jim | schedar | Male speaker
-VOICE: Joe | gacrux | Male speaker
-VOICE: John | achernar | Male speaker
+VOICE: Joe | charon | Male speaker
+VOICE: John | schedar | Male speaker
 VOICE: Mark | achird | Male speaker
 VOICE: Kim | aoede | Female speaker
 VOICE: Ali | schedar | Male speaker
-VOICE: Pat | gacrux | Male speaker
-VOICE: Luke | achernar | Male speaker
+VOICE: Pat | achird | Male speaker
+VOICE: Luke | achird | Male speaker
 VOICE: Tony | achird | Male speaker
 VOICE: Andy | schedar | Male speaker
-VOICE: Art | gacrux | Male speaker
-VOICE: Phil | achernar | Male speaker
+VOICE: Art | charon | Male speaker
+VOICE: Phil | charon | Male speaker
 VOICE: Tim | achird | Male speaker
 VOICE: Sharif | schedar | Male speaker
-VOICE: Owen | gacrux | Male speaker
-VOICE: Chuck | achernar | Male speaker
+VOICE: Owen | charon | Male speaker
+VOICE: Chuck | achird | Male speaker
 VOICE: Bob | achird | Male speaker
 VOICE: Don | schedar | Male speaker
-VOICE: Jack | gacrux | Male speaker
-VOICE: Bill | achernar | Male speaker
+VOICE: Jack | achird | Male speaker
+VOICE: Bill | schedar | Male speaker
 VOICE: Dale | achird | Male speaker
 VOICE: Gene | schedar | Male speaker
 VOICE: Lynn | aoede | Female speaker
 VOICE: Gwen | aoede | Female speaker
-VOICE: ID | achernar | speaker (auto)
 VOICE: Narrator | achird | speaker (auto)
 
 $SESSION 1-1: Climate and Weather at the Beach