Commit 071b4ab made mount() return SUCCESS as soon as it saw the intermediate
TELL "state"/Busy event, before the later "Gripper detection" event is read,
so an empty-gripper mount completed silently with no MountingFailed/pop-up.
check_command_ok blocks (wait_not_busy) until the mount sequence finishes, so
after it returns the robot's own record is authoritative: if get_mounted_sample()
is None the gripper was empty -> return NO_PIN_IN_GRIPPER, which the mounting
service maps to MountingFailed("No Pin in Gripper"). Covers manual and automation.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
