vocab: stop re-teaching a word later in the same session (239 tags)

A word tagged VOCAB in one activity was tagged again in later activities of the
same session, so the learner got the same chip repeatedly — most visibly in the
pronunciation drills, which re-listed every word from the dialogue before them
(reported: book 7 session 1-2). Rule applied: drop a VOCAB whose word was
already tagged in an EARLIER activity of that session. Repeats INSIDE one
activity are kept — those teach distinct senses ('stuck to his finger' vs
'stuck the milk in the fridge', 'shop' as verb then noun). Also dropped chips
for plurals of already-known words in book 7 session 1-2, where the drill
teaches the singular/plural pair rather than new vocabulary. No session lost
all of its vocabulary (verified).

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

book-6-lesson-1.module

@@ -75,13 +75,11 @@ INTRO: Now the same words from the lab tape — rain, clouds, and the things you
 INSTRUCTION: Repeat each word and sentence.
 REPEAT
 
-VOCAB: sky
 LINE: The plane is in the sky. {page_011_001.jpg} {bk06-l1a-f1-01.mp3}
 
 VOCAB: clouds
 LINE: There are clouds in the sky. {page_011_002.jpg} {bk06-l1a-f1-02.mp3}
 
-VOCAB: rain
 LINE: There's a lot of rain outside. {page_011_003.jpg} {bk06-l1a-f1-03.mp3}
 
 VOCAB: raincoat
@@ -141,10 +139,8 @@ INTRO: More weather words from the tape — showers, storms, sun, and snow. List
 INSTRUCTION: Repeat each word and sentence.
 REPEAT
 
-VOCAB: shower
 LINE: There was a shower yesterday. {page_013_001.jpg} {bk06-l1a-f4-01.mp3}
 
-VOCAB: storm
 LINE: They were walking in the storm yesterday. {page_013_002.jpg} {bk06-l1a-f4-02.mp3}
 
 VOCAB: get
@@ -156,10 +152,8 @@ LINE: There was a change in the weather after the rain. {page_013_004.jpg} {bk06
 VOCAB: weather
 LINE: The weather is good today. {page_014_001.jpg} {bk06-l1a-f4-05.mp3}
 
-VOCAB: sun
 LINE: The sun is very hot. {page_014_002.jpg} {bk06-l1a-f4-06.mp3}
 
-VOCAB: snow
 LINE: They play in the snow in the winter. {page_014_003.jpg} {bk06-l1a-f4-07.mp3}
 
 # Source: LLA 1A Figure 5 (split into two — image-option pool capped at 6)
@@ -219,11 +213,9 @@ VOCAB: dry
 LINE: I need a dry towel; this one's wet.
 LINE: There's no water in the swimming pool. It's dry.
 
-VOCAB: raincoat
 LINE: Wear your raincoat. It's raining.
 LINE: My clothes didn't get wet. I was wearing my raincoat.
 
-VOCAB: umbrella
 LINE: I don't need a raincoat. I have an umbrella.
 LINE: Open your umbrella; it's starting to rain.
 
@@ -1143,13 +1135,10 @@ REPEAT
 VOCAB: cry
 LINE: Sally is crying. {bk06-l1c-f3-01.mp3}
 
-VOCAB: upset
 LINE: She's very upset. {bk06-l1c-f3-02.mp3}
 
-VOCAB: score
 LINE: She's upset about her score. {bk06-l1c-f3-03.mp3}
 
-VOCAB: grade
 LINE: She wanted a good grade. Her grade on the test was only 40. Now she is upset. {bk06-l1c-f3-04.mp3}
 
 VOCAB: think