Source or hex file for the exact code shipped on STM32C0116-DK? It baffles me that a demo kit like this does not have specific details on how the code installed in the flash was compiled, from which environment (Cube? IAR? Keil?) and where is source.

[S.Ma]

The out of the box demo for such a simple board is probably the LED blinky.

For the STM32C0316-DK there is a full fledged demo here