[compiler] Refactor checker to use context, fixing template decorator bugs#9588

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witemple-msft wants to merge 9 commits intomicrosoft:mainfrom

witemple-msft:witemple-msft/check-ctx

Commits on Feb 3, 2026

Refactored mapper into checker context.
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Commits on Feb 5, 2026

Repaired some cases where we were still using mapper instead of ctx.
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Implemented instantiation logic for checking ArrayExpressions, which act as template instantiations.
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