Adopt `openWorldHint` for responses that contain user-generated content

[connor4312]

The openWorldHint on tool annotations can be used to indicate that the tool produces output derived from an "open world" of data

		/**
		 * If true, this tool may interact with an "open world" of external
		 * entities. If false, the tool's domain of interaction is closed.
		 * For example, the world of a web search tool is open, whereas that
		 * of a memory tool is not.
		 *
		 * Default: true
		 */
		openWorldHint?: boolean;

This should be adopted in GH MCP tools so that clients can present the appropriate confirmation for this data.

[Vidit-Ostwal]

Does this mean to change all the existing tools and add a annotation flag, in each one of them?,
Also changing the test cases for each one of them.
@omgitsads , @connor4312