.NET: Replace deprecated AWSSDK.Extensions.Bedrock.MEAI with AWS.Bedrock.MEAI

[Ben Thompson (BenGearset)]

Motivation & Context

AWS has deprecated the AWSSDK.Extensions.Bedrock.MEAI package. Its nuget.org listing now carries a deprecation notice and points to AWS.Bedrock.MEAI as the replacement

Description & Review Guide

• What are the major changes?
• What is the impact of these changes?
• What do you want reviewers to focus on?

Swapped the package references to the new package.

Related Issue

Fixes #7982

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR is linked to an issue and there is no other open PR for this issue (see Related Issue above).
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after any language prefix) — a workflow keeps the label and title prefix in sync automatically.

[Ben Thompson (BenGearset)]

@microsoft-github-policy-service agree company="Gearset"

[Copilot]

Pull request overview

Replaces the deprecated Bedrock MEAI adapter with its maintained successor while preserving sample behavior.

Changes:

• Updates the centrally managed package to AWS.Bedrock.MEAI 1.0.0.
• Updates the Bedrock sample dependency and documentation.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
dotnet/Directory.Packages.props	Defines the replacement package version.
dotnet/samples/02-agents/AgentWithMemory/AgentWithMemory_Step03_MemoryUsingValkey_Bedrock/AgentWithMemory_Step03_MemoryUsingValkey_Bedrock.csproj	References the replacement adapter.
dotnet/samples/02-agents/AgentWithMemory/AgentWithMemory_Step03_MemoryUsingValkey_Bedrock/README.md	Updates package references in the documentation.

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