Implement logic core facade

docs/host_logic_rebuild.md

@@ -63,13 +63,15 @@ Implemented behavior:
 
 ### Node 4: core facade
 
-Files planned after session:
+Files completed in this step:
 
 - `KeyBorad/KeyBorad/LOGIC/Lgc_Core.h`
 - `KeyBorad/KeyBorad/LOGIC/Lgc_Core.cpp`
 
-Target behavior:
+Implemented behavior:
 
 - give APP one small entry point
-- forward start/poll/close to session
-- refresh state from handshake results
+- start CDC handshake through session
+- expose `Start / Poll / Close / GetState`
+- refresh state from `HelloRsp`
+- update a simple action text when packets arrive