Copilot/add expression decorations#9747

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johanste wants to merge 6 commits intomicrosoft:mainfrom

johanste:copilot/add-decorators-support

Commits on Feb 19, 2026

Initial plan
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feat: add DecoratedExpression AST node type and parser/checker/formatter support

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feat: handle DecoratedExpression in checkModelIs and checkClassHeritage; add tests

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docs: update decorators.md, models.md, and documentation sample with decorated expressions

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fix: apply only new decorators individually to avoid re-applying existing ones

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fix: address CI failures - lint warning, formatting, changeset, and sample snapshot

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johanste
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