feat(durable): large-payload overflow for Durable Execution (batch ReplayChildren + batcher byte cap)

.autover/autover.json

@@ -47,6 +47,11 @@
       "Name": "Amazon.Lambda.Core",
       "Path": "Libraries/src/Amazon.Lambda.Core/Amazon.Lambda.Core.csproj"
     },
+    {
+      "Name": "Amazon.Lambda.DurableExecution",
+      "Path": "Libraries/src/Amazon.Lambda.DurableExecution/Amazon.Lambda.DurableExecution.csproj",
+      "PrereleaseLabel": "preview"
+    },
     {
       "Name": "Amazon.Lambda.DynamoDBEvents",
       "Path": "Libraries/src/Amazon.Lambda.DynamoDBEvents/Amazon.Lambda.DynamoDBEvents.csproj"

.autover/changes/1086291e-5286-4ea4-b9c1-af4eb1d0314d.json

@@ -0,0 +1,11 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.DurableExecution",
+      "Type": "Minor",
+      "ChangelogMessages": [
+        "Implement NestingType.Flat for ParallelAsync and MapAsync (previously threw NotSupportedException). Under Flat, each branch/item runs in a virtual context that emits no per-branch CONTEXT checkpoint; per-branch results and errors are recorded inline on the parent operation's payload, reducing checkpoint volume. Operations inside a flat branch (steps, waits) still checkpoint, re-parented to the parallel/map operation. NestingType.Nested remains the default."
+      ]
+    }
+  ]
+}

.autover/changes/91693d62-b0c7-49b0-a74f-531aa1509864.json

@@ -0,0 +1,11 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.DurableExecution",
+      "Type": "Patch",
+      "ChangelogMessages": [
+        "Initial preview release of the Durable Execution SDK for .NET. Build long-running Lambda workflows with automatic checkpointing via `StepAsync`, `WaitAsync`, `RunInChildContextAsync`, `CreateCallbackAsync`, and `WaitForCallbackAsync` on `IDurableContext`."
+      ]
+    }
+  ]
+}

.autover/changes/durable-mapasync.json

@@ -0,0 +1,11 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.DurableExecution",
+      "Type": "Patch",
+      "ChangelogMessages": [
+        "Add `MapAsync` to `IDurableContext` for processing a collection in parallel with one child context per item and automatic checkpointing. Supports configurable max concurrency, completion policy, and per-item naming via `MapConfig`, returning an `IBatchResult<T>`."
+      ]
+    }
+  ]
+}

.autover/changes/durable-parallelasync.json

@@ -0,0 +1,11 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.DurableExecution",
+      "Type": "Patch",
+      "ChangelogMessages": [
+        "Add `ParallelAsync` to `IDurableContext` for running multiple workflow branches concurrently with automatic checkpointing. Supports configurable max concurrency, failure tolerance, and first-successful completion via `ParallelConfig`, returning an `IBatchResult<T>`."
+      ]
+    }
+  ]
+}

.gitignore

@@ -41,3 +41,6 @@ global.json
 
 **/cdk.out/**
 **/.DS_Store
+
+# JetBrains Rider per-project cache
+**/*.lscache

CONTRIBUTING.md

@@ -85,6 +85,7 @@ The available projects are:
 * Amazon.Lambda.ConfigEvents
 * Amazon.Lambda.ConnectEvents
 * Amazon.Lambda.Core
+* Amazon.Lambda.DurableExecution
 * Amazon.Lambda.DynamoDBEvents
 * Amazon.Lambda.DynamoDBEvents.SDK.Convertor
 * Amazon.Lambda.KafkaEvents