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

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

book-10-lesson-4.module

@@ -104,6 +104,7 @@ ID: 10-4a-f2
 INTRO: Now check that you know who's who. Listen to each question about family relationships, tap the correct answer, then repeat the model statement.
 INSTRUCTION: Tap the correct answer.
 REPEAT
+HIDE_PROMPT
 
 PROMPT: Who's my father's father? {bk10-l4a-f2-01.mp3}
 OPTION: a | my grandfather
@@ -616,6 +617,7 @@ $PRODUCE Changing a Flat Tire
 ID: 10-4a-f4-p1
 INPUT: type
 CHECK: exact
+HIDE_PROMPT
 INTRO: A man changes a flat tire, step by step. Listen to each step and type the ordering word you hear.
 INSTRUCTION: Type the missing connective word.
 
@@ -644,6 +646,7 @@ $PRODUCE Using the Vending Machine
 ID: 10-4a-f4-p2
 INPUT: type
 CHECK: exact
+HIDE_PROMPT
 INTRO: Same job, new machine — buying a snack, one step at a time. Listen to each step and type the ordering word you hear.
 INSTRUCTION: Type the missing connective word.
 
@@ -1563,6 +1566,7 @@ ID: 10-4c-f4-cloze
 INPUT: type
 CHECK: exact
 REPEAT
+HIDE_PROMPT
 INTRO: Now use those words yourself. Complete each sentence with a word from the box — "articles", "famous", "magazines", "news", "newspapers" — then listen and repeat the complete sentence.
 INSTRUCTION: Type the missing word(s).
 
@@ -1898,6 +1902,7 @@ INTRO: Last stop: a short story about a very good neighbor. Type each sentence e
 INSTRUCTION: Type the sentence you hear.
 INPUT: type
 CHECK: exact
+HIDE_PROMPT
 
 PROMPT: Mrs. Wright is my neighbor. {bk10-l4d-f5-01.mp3}
 RESPONSE: Mrs. Wright is my neighbor. {bk10-l4d-f5-01.mp3}