fix(server): add icons field to registerTool and registerToolTask

[nielskaspers]

Summary

registerTool() and registerToolTask() do not accept the icons field, even though ToolSchema includes it via IconsSchema.shape. This adds icons support to both APIs and includes it in tools/list responses.

Issue

Fixes #1864

Changes

• Added icons?: Icon[] to the registerTool() config parameter type
• Added icons to _createRegisteredTool() signature and object construction
• Added icons to the tools/list handler's toolDefinition object
• Added icons to RegisteredTool type and its update() method
• Added icons to all registerToolTask() overload signatures and its call to _createRegisteredTool()

Testing

• All 55 existing server tests pass
• Full monorepo build succeeds

[changeset-bot]

🦋 Changeset detected

Latest commit: 55ded99

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@modelcontextprotocol/server	Patch
@modelcontextprotocol/express	Patch
@modelcontextprotocol/fastify	Patch
@modelcontextprotocol/hono	Patch
@modelcontextprotocol/node	Patch

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commit: 55ded99