fix(core): request/response events' stream discrimination.

[samchon]

This pull request refactors how request and response events are typed and constructed in the Agentica core package, improving type safety and clarity for streaming and non-streaming OpenAI chat completion events. The main changes introduce discriminated union types for events, update factory functions to leverage these types, and simplify event handling logic throughout the codebase.

Event Type System Improvements

• Refactored AgenticaRequestEvent and AgenticaResponseEvent from interfaces to discriminated union types, with distinct types for streaming and non-streaming events, making event handling more type-safe and explicit. [1] [2]

Factory Function Updates

• Updated createRequestEvent and createResponseEvent to use generic parameters that enforce the correct body and completion types depending on the stream flag, aligning with the new event type definitions. [1] [2] [3]

Request/Response Handling Logic

• Modified request creation in getChatCompletionFunction to explicitly set the stream property and use the correct body type for each event.
• Refactored response event construction to use the new discriminated union types, replacing the previous nested response property with top-level stream, body, and completion properties. [1] [2]

Test Code Adaptation

• Updated test logic to use the new event properties (event.stream and event.completion), ensuring compatibility with the refactored event types.

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@agentica/benchmark

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commit: ba4eca0