chore: remove deprecated flow_boundary and update docs to match new architecture

crates/components/src/heat_exchanger/exchanger.rs

@@ -287,10 +287,12 @@ impl<Model: HeatTransferModel + 'static> HeatExchanger<Model> {
         self.hot_conditions.as_ref()
     }
 
+    /// Documentation pending
     pub fn cold_conditions(&self) -> Option<&HxSideConditions> {
         self.cold_conditions.as_ref()
     }
 
+    /// Documentation pending
     pub fn hot_fluid_id(&self) -> Option<&FluidsFluidId> {
         self.hot_conditions.as_ref().map(|c| c.fluid_id())
     }
@@ -461,6 +463,7 @@ impl<Model: HeatTransferModel + 'static> HeatExchanger<Model> {
         FluidState::new(temperature, pressure, enthalpy, mass_flow, cp)
     }
 
+    /// Documentation pending
     pub fn compute_residuals_with_ua_scale(
         &self,
         _state: &StateSlice,
@@ -470,6 +473,7 @@ impl<Model: HeatTransferModel + 'static> HeatExchanger<Model> {
         self.do_compute_residuals(_state, residuals, Some(custom_ua_scale))
     }
 
+    /// Documentation pending
     pub fn do_compute_residuals(
         &self,
         _state: &StateSlice,
@@ -698,7 +702,7 @@ impl<Model: HeatTransferModel + 'static> Component for HeatExchanger<Model> {
 
     fn port_enthalpies(
         &self,
-        state: &StateSlice,
+        _state: &StateSlice,
     ) -> Result<Vec<entropyk_core::Enthalpy>, ComponentError> {
         let mut enthalpies = Vec::with_capacity(4);