Relocate added_mass to chrono layer and remove stale coupling folder

Author: dav-og

CMakeLists.txt

@@ -344,8 +344,6 @@ set(HYDROCHRONO_SOURCES
     src/hydro/config/config_loader.cpp
     src/hydro/config/setup_from_yaml.cpp
     src/hydro/config/yaml_discovery.cpp
-    # Coupling module (consolidated under src/hydro/coupling/)
-    src/hydro/coupling/added_mass.cpp
     # Core facade and utilities
     src/hydro/hydro_forces.cpp
     src/hydro/utils/helper.cpp
@@ -360,6 +358,7 @@ set(HYDROCHRONO_SOURCES
     # Chrono coupling layer (bridges Chrono physics with Chrono-free core)
     src/hydro/chrono/chrono_state_utils.cpp
     src/hydro/chrono/chrono_hydro_coupler.cpp
+    src/hydro/chrono/added_mass.cpp
     src/hydro/force_components/hydrostatics_component.cpp
     src/hydro/force_components/radiation_component.cpp
     src/hydro/force_components/excitation_component.cpp

include/hydroc/coupling/added_mass.h

@@ -1,7 +1,13 @@
 /*********************************************************************
  * @file  added_mass.h
+ * @brief ChLoadAddedMass: Chrono load for infinite-frequency added mass.
  *
- * @brief Header file for added mass ChLoad class.
+ * MAIN TYPES:
+ *   - ChLoadAddedMass: ChLoadCustomMultiple subclass that applies
+ *     added mass from HDF5 hydrodynamic data to Chrono bodies.
+ *
+ * ROLE: Chrono coupling layer. Used internally by HydroForces to attach
+ * added mass forces to the Chrono simulation system.
  *********************************************************************/
 
 #ifndef HYDROC_COUPLING_ADDED_MASS_H

src/hydro/coupling/added_mass.cpp src/hydro/chrono/added_mass.cppsrc/hydro/coupling/added_mass.cpp renamed to src/hydro/chrono/added_mass.cpp

@@ -1,8 +1,11 @@
 /*********************************************************************
  * @file  added_mass.cpp
+ * @brief Implementation of ChLoadAddedMass: Chrono load for added mass.
  *
- * @brief Implementation of ChLoadAddedMass class.
+ * ROLE: Chrono coupling layer. Provides a ChLoadCustomMultiple subclass
+ * that applies infinite-frequency added mass from HDF5 data to bodies.
  *********************************************************************/
+
 #include <hydroc/coupling/added_mass.h>
 
 #include <utility>