drop kaptan-runtime crate

Signed-off-by: Onur Özkan <work@onurozkan.dev>

README.md

@@ -19,7 +19,8 @@ The repository is currently in infrastructure setup. Formal project specificatio
 
 ## Repository Structure
 
-- `kaptan-runtime/`: bare-metal runtime crate scaffold.
+- `boards/<board>/`: board firmware crates with the RTIC application, MCU bindings and board-specific configuration.
+- `libs/`: reusable libraries that do not own a board firmware lifecycle.
 - `tests/sitl/`: host-side simulation and deterministic verification scaffolding.
 - `tests/hitl/`: hardware-in-the-loop scaffolding.
 - `scripts/`: repository validation and developer helper scripts.