enhancement(types): AgentContext type

[jeseed]

I was also wondering what you thought of making a similar type available:

import { type ContextEntry, type MastraParams } from 'cedar-os';

export type AgentContext = MastraParams & {
additionalContext: Record<string, ContextEntry[]> & {
dashboard?: {
id: string;
data: { id: string; value: string };
}[];
};
};