Feat: Multinode gRPC

[Finn-Andersonn]

Describe your changes

WIP

CED-1843

Multi-Part Helper Communication

Checklist before requesting a review

• Have I performed a self-review?
• Have I added regression or unit tests (where it makes sense) for my changes?
• Have I updated the docs if changes have resulted in it being out of date?
• Have I checked to ensure my PR only introduces the changes it's intended to? E.g. No extraneous formatting changes.
• Have I ensured that there are no performance regressions by checking benchmark results?
• Is this a breaking change? If yes, please describe areas affected and request reviews from developer stakeholders.

[github-actions]

The latest Buf updates on your PR. Results from workflow Push / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	⏩ skipped	✅ passed	⏩ skipped	Feb 5, 2026, 8:27 AM