D034 - CLI, GUI, and worker are interaction shims; logic lives in the crates

decided · 2026-08-19

No shim contains logic. The crates are the emulator. A shim calls the relevant crate directly, or orbistoun-service where shared orchestration is warranted.

With three shims, a shared service stops being optional - it is what all three call, and the protocol (D035) becomes a serialisable projection of its operations rather than a parallel API free to drift. The same principle another project of mine settled on, applied here.

Consequence for the current code: orbistoun-cli today owns real logic - build_registry knows the full module set and the survey flow is assembled in main.rs. That extraction happens before the GUI and before the CLI grows any further, since it gets more expensive with every command added.