[Repo Assist] feat: implement textDocument/prepareTypeHierarchy, typeHierarchy/supertypes, typeHierarchy/subtypes#1508

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Commits on Mar 18, 2026

Commits on Mar 24, 2026

test: add TypeHierarchy integration tests (prepareTypeHierarchy, supertypes, subtypes)

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Commits on Mar 25, 2026

fix: correct TypeHierarchy supertypes and subtypes bugs

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fix: exclude external assembly types from TypeHierarchy supertypes

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