System.Text.Json: transitive `[JsonDerivedType]` resolution + cross-assembly boundary semantics #124506

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Copilot wants to merge 4 commits into main from copilot/implement-json-polymorphism-feature

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System.Text.Json: transitive `[JsonDerivedType]` resolution + cross-assembly boundary semantics #124506

Polish transitive polymorphism helper naming and docs

Azure Pipelines / runtime-dev-innerloop (Build linux_musl-x64 debug Musl_Validation) succeeded Feb 17, 2026 in 15m 35s

Build linux_musl-x64 debug Musl_Validation succeeded

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