MAINT: Remove unused fields in MessagePiece#1616

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behnam-o wants to merge 14 commits intomicrosoft:mainfrom

behnam-o:dev/message-piece-unused

Commits on Apr 15, 2026

Remove unused fields in message_piece
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Commits on Apr 16, 2026

revert unwanted changes
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immutable prop
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ref public prop
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deprecate instead of remove
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update md
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Merge branch 'main' into dev/message-piece-unused
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import warning
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tests for CC
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test fix
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revert notebooks
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revert notebook
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no deprecate, just remove
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fix _scores definition
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