Aligning on what we develop in sysand_core and the surfaces (CLI, bindings x3)

[consideRatio]

Extracted from #292. I think we ought to try align our expectations on what we look to develop in sysand_core, the CLI, and bindings.

I propose we resolve this issue by having a video chat and writing down what we align on as developer facing documentation.

I haven't onboarded fully to the code base, but my expectation is that:

• we have the core rust library as the foundation
• we have four surfaces (CLI, bindings x3) exposing foundation parts
• we typically just expose the foundation parts required for CLI commands
• we don't add anything in the surfaces implementations besides the minimal thing to adjust to the specific surface