Update M.E.AI changelogs for 9.8.0 (dotnet#6714)

Author: stephentoub

src/Libraries/Microsoft.Extensions.AI.Abstractions/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## NOT YET RELEASED
+## 9.8.0
 
 - Added `AIAnnotation` and related types to represent citations and other annotations in chat messages.
 - Added `ChatMessage.CreatedAt` so that chat messages can carry their timestamp.
@@ -10,12 +10,17 @@
 - Added `HostedVectorStoreContent` for representing vector stores hosted by the service.
 - Added `HostedFileSearchTool` to represent server-side file search tools.
 - Added `HostedCodeInterpreterTool.Inputs` to supply context about what state is available to the code interpreter tool.
+- Added [Experimental] `IImageGenerator` and supporting types.
 - Improved handling of function parameter data annotation attributes in `AIJsonUtilities.CreateJsonSchema`.
 - Fixed schema generation to include an items keyword for arrays of objects in `AIJsonUtilities.CreateJsonSchema`.
 
 ## 9.7.1
 
 - Fixed schema generation for nullable function parameters in `AIJsonUtilities.CreateJsonSchema`.
+- Added a flag for `AIFunctionFactory` to control whether return schemas are generated.
+- Added `DelegatingAIFunction` to simplify creating `AIFunction`s that call other `AIFunction`s.
+- Updated `AIFunctionFactory` to tolerate JSON string function parameters.
+- Fixed schema generation for nullable value type parameters.
 
 ## 9.7.0
 
@@ -70,7 +75,7 @@
 - Added `MessageId` to `ChatMessage` and `ChatResponseUpdate`.
 - Added `AIFunctionArguments`, changing `AIFunction.InvokeAsync` to accept one and to return a `ValueTask`.
 - Updated `AIJsonUtilities`'s schema generation to not use `default` when `RequireAllProperties` is set to `true`.
-- Added `ISpeechToTextClient` and supporting types.
+- Added [Experimental] `ISpeechToTextClient` and supporting types.
 - Fixed several issues related to Native AOT support.
 
 ## 9.3.0-preview.1.25161.3

src/Libraries/Microsoft.Extensions.AI.AzureAIInference/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## NOT YET RELEASED
+## 9.8.0-preview.1.25412.6
 
 - Updated to depend on Azure.AI.Inference 1.0.0-beta.5.
 - Updated to accommodate the additions in `Microsoft.Extensions.AI.Abstractions`.

src/Libraries/Microsoft.Extensions.AI.OpenAI/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## NOT YET RELEASED
+## 9.8.0-preview.1.25412.6
 
 - Updated to depend on OpenAI 2.3.0.
 - Added more conversion helpers for converting bidirectionally between Microsoft.Extensions.AI messages and OpenAI messages.
@@ -10,6 +10,7 @@
 ## 9.7.1-preview.1.25365.4
 
 - Added some conversion helpers for converting Microsoft.Extensions.AI messages to OpenAI messages.
+- Enabled specifying "strict" via ChatOptions for OpenAI clients.
 
 ## 9.7.0-preview.1.25356.2
 

src/Libraries/Microsoft.Extensions.AI/CHANGELOG.md

@@ -1,13 +1,16 @@
 # Release History
 
-## NOT YET RELEASED
+## 9.8.0
 
 - Added `FunctionInvokingChatClient.AdditionalTools` to allow `FunctionInvokingChatClient` to have access to tools not included in `ChatOptions.Tools` but known to the target service via pre-configuration.
+- Added [Experimental] `IChatReducer` and supporting types
 - Updated to accommodate the additions in `Microsoft.Extensions.AI.Abstractions`.
 
 ## 9.7.1
 
+- Added `FunctionInvokingChatClient.FunctionInvoker` to simplify customizing how functions are invoked.
 - Increased the default `FunctionInvokingChatClient.MaximumIterationsPerRequest` value from 10 to 40.
+- Updated the Open Telemetry instrumentation to conform to the latest 1.36.0 draft specification of the Semantic Conventions for Generative AI systems.
 - Updated to accommodate the additions in `Microsoft.Extensions.AI.Abstractions`.
 
 ## 9.7.0