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Ben Taylor b038115174 fix(sdk-js): preserve AIMessage metadata in middleware (#6091 )

## What does this PR do?

- Preserve non-tool `AIMessage` fields when frontend tool calls are
intercepted in `afterModel` and restored in `afterAgent`, including
`additional_kwargs`, `response_metadata`, `usage_metadata`,
`invalid_tool_calls`, `id`, and `name`.
- Use a shared rebuild helper with `tool_calls` as the source of truth.
For LangChain v1 content blocks, remove stale `tool_call` and
`tool_call_chunk` blocks before reconstructing the message.
- Add regression coverage for the `reasoning + backend/frontend tool
calls -> afterModel -> afterAgent` flow, including metadata preservation
and v1 content block synchronization.

## Related PRs and Issues

- Closes #6087
- Related to #4759 and #5308

## Checklist

- [x] I have read the [Contribution
Guide](https://github.com/copilotkit/copilotkit/blob/master/CONTRIBUTING.md)
- [x] Documentation is not required because this is an internal
middleware bug fix with no public API changes
- [x] "Allow edits by maintainers" is checked (lets us help iterate on
your PR directly — faster turnaround for everyone)

2026-07-23 12:01:03 -05:00