Critical fixes #1-8: wall coords, calib reset, cmd=0 guard, fence marking, loc_conf, params callback, CMake maps

- SessionMapper: fix wall line construction (0/w/h → x_min/x_max/y_min/y_max)
- session_mapper.reset() on calibration failure
- CALIBRATING state forces cmd_vel=0
- GridMap::markFenceModel() draws calibrated fence into static_cells_
- /nav_metrics now publishes loc_conf
- add_on_set_parameters_callback handles all new params
- CMake maps install guarded with EXISTS check

CMakeLists.txt

@@ -42,6 +42,9 @@ add_executable(calib_check src/calib_check.cpp)
 target_include_directories(calib_check PRIVATE ${INCLUDE_DIR} ${EIGEN3_INCLUDE_DIRS})
 ament_target_dependencies(calib_check rclcpp geometry_msgs nav_msgs tf2 tf2_ros)
 install(TARGETS nav_lite_node calib_check DESTINATION lib/${PROJECT_NAME})
-install(DIRECTORY launch config maps DESTINATION share/${PROJECT_NAME})
+install(DIRECTORY launch config DESTINATION share/${PROJECT_NAME})
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/maps")
+  install(DIRECTORY maps DESTINATION share/${PROJECT_NAME})
+endif()
 
 ament_package()