Rewrite the stream option in registerCopilotKit by Mastra according to the context.

[kosukeoya]

Current Situation

The threadId is passed from RunAgentInput, and the resourceId becomes either a fixed agent ID or the threadId passed from RunAgentInput.
In my use case, I want to include information obtained through session authentication (which can be referenced as c.get('user').id in hono, for example) in the resourceId and threadId. For this, it would be good to have middleware that can set options when calling agent.stream.

Without this, it is not possible to separate conversation histories for each user.

ag-ui/integrations/mastra/typescript/src/mastra.ts

Line 279 in 35e409b

const response = await this.agent.stream(convertedMessages, {

conversation: https://discord.com/channels/1309558646228779139/1440176787911872673

[kosukeoya]

I think you will understand what I want to do if you look at this code. It's not necessary to specify all streamOptions; memory alone is fine, but it might be needed in the future.
https://github.com/ag-ui-protocol/ag-ui/pull/715/files

[tylerschoppe]

Seems like a small part of this issue I opened awhile ago #307