Update ModelContextProtocol to latest

[stephentoub]

What does this PR do?

Updates ModelContextProtocol dependency to 0.6.0-preview.1. Also bump Microsoft.Extensions.* to latest.

[Copilot]

Pull request overview

This PR updates the ModelContextProtocol dependency from 0.4.0-preview.3 to 0.6.0-preview.1 (note: PR description mentions 0.5.0-preview.1 but actual version is 0.6.0-preview.1) and updates several Microsoft.Extensions.* packages from version 10.0.1 to 10.0.2. The changes adapt the codebase to breaking API changes in the ModelContextProtocol library.

Changes:

• Updated ModelContextProtocol and ModelContextProtocol.AspNetCore packages to 0.6.0-preview.1
• Updated Microsoft.Extensions.* packages (AI, Caching, Configuration, DependencyInjection, Hosting) to their latest versions (10.0.2 or 10.2.0)
• Updated System.* packages to version 10.0.2
• Adapted code to API changes: IReadOnlyDictionary → IDictionary for tool arguments, Content property now a collection, added required MaxTokens property, and renamed SetLoggingLevel → SetLoggingLevelAsync

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Directory.Packages.props	Updated ModelContextProtocol packages to 0.6.0-preview.1 and bumped Microsoft.Extensions.* and System.* packages to latest versions; reorganized Microsoft.CognitiveServices.Speech package location
core/Azure.Mcp.Core/src/Commands/CommandExtensions.cs	Changed parameter type from IReadOnlyDictionary<string, JsonElement> to IDictionary<string, JsonElement> to match updated ModelContextProtocol API
core/Azure.Mcp.Core/src/Areas/Server/Commands/ToolLoading/BaseToolLoader.cs	Updated to use IDictionary instead of IReadOnlyDictionary for tool arguments
core/Azure.Mcp.Core/src/Areas/Server/Commands/ToolLoading/RegistryToolLoader.cs	Changed TransformArgumentsToDictionary method signature to accept IDictionary instead of IReadOnlyDictionary
core/Azure.Mcp.Core/src/Areas/Server/Commands/ToolLoading/NamespaceToolLoader.cs	Updated method signatures, added MaxTokens property to sampling requests, changed Content to collection syntax, updated content access pattern, and added named cancellationToken parameter
core/Azure.Mcp.Core/src/Areas/Server/Commands/ToolLoading/ServerToolLoader.cs	Applied same API updates as NamespaceToolLoader: collection-based Content, MaxTokens addition, and updated content access pattern
core/Azure.Mcp.Core/src/Areas/Server/Commands/ToolLoading/SingleProxyToolLoader.cs	Applied consistent API updates including collection-based Content, MaxTokens property, and updated sampling response handling
core/Azure.Mcp.Core/tests/Azure.Mcp.Core.UnitTests/Areas/Server/Commands/ToolLoading/*.cs	Updated test helper methods to use IDictionary instead of IReadOnlyDictionary for consistency with production code
core/Azure.Mcp.Core/tests/Azure.Mcp.Core.UnitTests/Areas/Server/Commands/ToolLoading/BaseToolLoaderTests.cs	Updated test to use collection syntax for Content property and added required MaxTokens field
core/Azure.Mcp.Core/tests/Azure.Mcp.Core.LiveTests/ClientToolTests.cs	Renamed method call from SetLoggingLevel to SetLoggingLevelAsync to match updated API
core/Azure.Mcp.Core/tests/Azure.Mcp.Core.UnitTests/Areas/Server/Commands/Runtime/McpRuntimeTests.cs	Updated test helper method signature to use IDictionary instead of IReadOnlyDictionary