Add course directory manifest and upload notes

.gitattributes

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-*.webm filter=lfs diff=lfs merge=lfs -text
-
-# BEGIN course-upload-20261023-46
-* filter=lfs diff=lfs merge=lfs -text
-"/_course_archive/Software-Engineering-46-20261023/**" filter=lfs diff=lfs merge=lfs -text
-/.gitattributes -filter -diff -merge text
-"/_course_archive/Software-Engineering-46-20261023/directory-structure.json" -filter -diff -merge text
-"/_course_archive/Software-Engineering-46-20261023/README.md" -filter -diff -merge text
-/README.md -filter -diff -merge text
-# END course-upload-20261023-46
-
-# BEGIN course-upload-20261024-20
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-"/_course_archive/Software-Engineering-20-20261024/**" filter=lfs diff=lfs merge=lfs -text
-/.gitattributes -filter -diff -merge text
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-"/_course_archive/Software-Engineering-20-20261024/README.md" -filter -diff -merge text
-# END course-upload-20261024-20
-
-# BEGIN course-upload-20261025-25
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-"/_course_archive/Software-Engineering-25-20261025/**" filter=lfs diff=lfs merge=lfs -text
-/.gitattributes -filter -diff -merge text
-"/_course_archive/Software-Engineering-25-20261025/directory-structure.json" -filter -diff -merge text
-"/_course_archive/Software-Engineering-25-20261025/README.md" -filter -diff -merge text
-# END course-upload-20261025-25
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