fix(cmake): add include_guard(GLOBAL) to Linting and Ccache modules

Consistent with ROS2MedkitCompat.cmake to prevent double-inclusion.

Author: bburda

cmake/ROS2MedkitCcache.cmake

@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+include_guard(GLOBAL)
+
 # Auto-detect and enable ccache if available.
 # Include this module early in CMakeLists.txt (before add_library/add_executable).
 #

cmake/ROS2MedkitLinting.cmake

@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+include_guard(GLOBAL)
+
 # Shared linting configuration for ros2_medkit packages.
 # Include this in CMakeLists.txt BEFORE the if(BUILD_TESTING) block
 # (alongside include(ROS2MedkitCcache) - CMAKE_MODULE_PATH is already set).