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docs(csharp): document the per-operation serializer override (Step/Callback/Invoke/WaitForCondition/ChildContext + Map/Parallel ItemSerializer) - #279
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The .NET SDK now supports an optional per-operation `Serializer` (an ILambdaSerializer) on StepConfig, CallbackConfig, InvokeConfig, WaitForConditionConfig<TState>, and ChildContextConfig; when null the globally-registered serializer is used. Update the C# tabs on the serialization page (Default serialization, SerDes interface, StepConfig, CallbackConfig) and the StepConfigExample/CallbackConfigExample examples. Map/Parallel C# tabs left as-is pending two-level (item + whole-result) support.
MapConfig<TItem> and ParallelConfig now expose ItemSerializer for each item/branch result; the aggregated batch envelope is SDK-internal and not user-serialized (no whole-result serializer). Update the Map/Parallel C# tab and MapConfigExample.
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Document missing operation config signatures, incremental parallel branches, custom subtype rules, terminal serializer failures, and local checkpoint-token omission for Core 2.2.0 and Testing 1.1.0. Leave the serialization guide and its examples to PRs #279 and #280. Keep shared prose and other language updates in PR #300. All remaining Markdown changes are inside C# tabs; no file overlaps #279 or #280. Validate formatting, spelling, snippets, vendored assets, rendered links, and a clean Zensical build. Retained examples match the previously compiled and runtime-checked versions.
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Summary
Documents the .NET per-operation serializer override on the C# tabs of the serialization reference. Companion to aws/aws-lambda-dotnet#2555.
SerializeronStepConfig/CallbackConfig(and note it reusesILambdaSerializer, so no new SerDes interface), and theItemSerializeronMapConfig/ParallelConfigfor per-item/branch results (the aggregate batch envelope is SDK-internal, so there is no whole-result serializer).Notes
Docs-only. Pairs with the SDK feature PR aws/aws-lambda-dotnet#2555.