Update M.E.AI changelogs with recent changes

Author: stephentoub

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

@@ -2,6 +2,9 @@
 
 ## NOT YET RELEASED
 
+- Unsealed `FunctionCallContent` and `FunctionResultContent`.
+- Added `InvocationRequired` property to `FunctionCallContent` to indicate whether function invocation is required.
+- Added `LoadFromAsync` and `SaveToAsync` helper methods to `DataContent` for file I/O operations.
 - Fixed JSON schema generation for nullable reference type annotations on parameters in AIFunctions.
 
 ## 10.2.0

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

@@ -1,5 +1,10 @@
 # Microsoft.Extensions.AI.OpenAI Release History
 
+## NOT YET RELEASED
+
+- Fixed tool call descriptions to not drop extraneous JSON properties.
+- Updated to accommodate the additions in `Microsoft.Extensions.AI.Abstractions`.
+
 ## 10.2.0-preview.1.26063.2
 
 - Updated the OpenAI Responses `IChatClient` to support `ResponseItem`s with input image urls.

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

@@ -1,9 +1,21 @@
 # Microsoft.Extensions.AI Release History
 
+## NOT YET RELEASED
+
+- Fixed `FunctionInvokingChatClient` to respect `ChatOptions.Tools` modifications made by function tools.
+- Fixed `FunctionInvokingChatClient` `invoke_agent` span detection.
+- Added logging to `FunctionInvokingChatClient` for approval flow, error handling, and loop control.
+- Removed `AIFunctionDeclaration` tools on last iteration in `FunctionInvokingChatClient`.
+- Allowed `FunctionResultContent` returned by `AIFunction`s to be used by `FunctionInvokingChatClient`.
+- Updated `OpenTelemetryChatClient` to include cached input token counts.
+- Updated `OpenTelemetryChatClient` for server tool call addition to the standard convention.
+- Fixed token metric unit in `OpenTelemetryChatClient` to use UCUM format.
+
 ## 10.2.0
 
 - Updated `FunctionInvokingChatClient` to respect `FunctionApprovalResponseContent.Reason`.
 - Improved `FunctionInvokingChatClient`'s handling of `FunctionApprovalResponseContent` items from messages with null `MessageId`s.
+
 ## 10.1.1
 
 - Updated to accommodate the additions in `Microsoft.Extensions.AI.Abstractions`.