- Implemented logic to aggregate text blocks until `message_stop` for improved consistency.
- Introduced support for message annotations like `citations_delta` in content responses.
- Added methods (`finalizeAssistantMessage`, `appendMessageAnnotation`) to handle message grouping and annotation appending cleanly.
- Updated unit tests to verify message aggregation, annotation handling, and suppression of unwanted native events.
Closes: #3801
dc04d8be52