[MCP] Improve namespaces

[glen-84]

No description provided.

[Copilot]

Pull request overview

This PR adjusts namespaces for MCP adapter extension methods to reduce the need for extra using directives and to align entry points with commonly imported namespaces (e.g., Microsoft.Extensions.DependencyInjection, HotChocolate, HotChocolate.Types).

Changes:

• Move MCP extension method containers into more commonly used namespaces (DI, HotChocolate, and HotChocolate.Types).
• Update docs/tests to remove now-unnecessary using HotChocolate.Adapters.Mcp.Extensions;.
• Rename the object-field descriptor extension container to avoid a name collision in HotChocolate.Types.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
website/src/docs/hotchocolate/v16/guides/mcp-adapter.md	Updates docs snippet to reflect the new extension method namespace.
src/HotChocolate/Adapters/test/Adapters.Mcp.Tests/OperationToolFactoryTests.cs	Removes now-unnecessary using for MCP extensions.
src/HotChocolate/Adapters/src/Fusion.Adapters.Mcp/Extensions/FusionGatewayBuilderExtensions.cs	Moves Fusion MCP gateway extensions into Microsoft.Extensions.DependencyInjection.
src/HotChocolate/Adapters/src/Adapters.Mcp/Extensions/SchemaBuilderExtensions.cs	Moves schema builder extension into HotChocolate namespace.
src/HotChocolate/Adapters/src/Adapters.Mcp/Extensions/ObjectFieldDescriptorExtensions.cs	Moves field-descriptor extension into HotChocolate.Types and renames the class to avoid collisions.
src/HotChocolate/Adapters/src/Adapters.Mcp.Core/Extensions/ServiceCollectionExtensions.cs	Removes an unused using.

Comments suppressed due to low confidence (1)

src/HotChocolate/Adapters/src/Adapters.Mcp/Extensions/SchemaBuilderExtensions.cs:8

• The new namespace change makes this type HotChocolate.SchemaBuilderExtensions, which already exists in the core library (e.g. src/HotChocolate/Core/src/Types/Extensions/SchemaBuilderExtensions.Types.cs:11). Having two public types with the same fully-qualified name across referenced assemblies will cause ambiguous type resolution for consumers that reference SchemaBuilderExtensions directly (e.g. SchemaBuilderExtensions.AddQueryType(...)). Consider renaming this class (e.g. McpSchemaBuilderExtensions) while keeping the HotChocolate namespace, or moving it to a non-conflicting namespace.

// ReSharper disable once CheckNamespace
namespace HotChocolate;

public static class SchemaBuilderExtensions
{
    public static ISchemaBuilder AddMcp(this ISchemaBuilder builder)

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