Add icons field support to registerTool() and registerToolTask()

[Christian-Sidak]

Summary

Fixes #1864

The MCP specs ToolSchemaincludesiconsviaIconsSchema, but the high-level registerTool()andregisterToolTask()APIs did not accept or pass through theiconsfield. This meanttools/list` responses never included icons even when the spec supports them.

Changes

• Add icons to RegisteredTool type and update() method
• Add icons parameter to _createRegisteredTool()
• Add icons to registerTool() and registerToolTask() config types
• Include icons in toolDefinition for tools/list responses
• Add test for tool registration with icons

Test plan

• All packages pass type-checking (pnpm typecheck:all)
• Added test verifying icons are accepted in registerTool() config and included in tools/list response

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Latest commit: 9ef7f4f

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