books 9-12: HIDE_PROMPT backfill — leak-shape locks, transcripts restored to clip-only prompts

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

book-9-lesson-2.module

@@ -489,6 +489,7 @@ INPUT: type
 CHECK: exact
 NORMALIZE: strict
 LONGFORM
+HIDE_PROMPT
 INTRO: You'll see each sentence with no capital letters or punctuation, and hear it read correctly. Type it the right way — capitals, commas, periods, everything counts here.
 INSTRUCTION: Type the sentence with correct capitalization and punctuation.
 
@@ -793,6 +794,7 @@ REFERENCE: 9-2b-f3
 INTRO: Look at each pair of pictures, listen to the question, and tap the right word. Then repeat the correct answer.
 INSTRUCTION: Tap the correct word.
 REPEAT
+HIDE_PROMPT
 
 PROMPT: Look at the houses. Are they similar, the same, or alike? {bk09-l2b-f3-houses.jpg|Two houses side by side: a brick house with a dark roof, and a different house with a slanted roof} {bk09-l2b-f3-05-q.mp3}
 OPTION: a | similar
@@ -2042,6 +2044,7 @@ $PRODUCE Write What You Hear
 ID: 9-2b-f8
 INPUT: type
 CHECK: exact
+HIDE_PROMPT
 INTRO: Listen to each sentence and type exactly what you hear. The full sentence plays back after you answer, so you can check yourself.
 INSTRUCTION: Type the sentence you hear.
 
@@ -2074,6 +2077,7 @@ $PRODUCE A Phone Call — Write Each Sentence
 ID: 9-2c-f5
 INPUT: type
 CHECK: exact
+HIDE_PROMPT
 INTRO: One more round of writing by ear: a short paragraph about John's long-distance call, one sentence at a time. Type each sentence you hear.
 INSTRUCTION: Type the sentence you hear.