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

bindings/c/src/components.rs

@@ -5,7 +5,7 @@
 use std::os::raw::{c_double, c_uint};
 
 use entropyk_components::{
-    Component, ComponentError, ConnectedPort, JacobianBuilder, ResidualVector, SystemState,
+    Component, ComponentError, ConnectedPort, JacobianBuilder, ResidualVector,
 };
 
 /// Opaque handle to a component.
@@ -34,7 +34,7 @@ impl SimpleAdapter {
 impl Component for SimpleAdapter {
     fn compute_residuals(
         &self,
-        _state: &SystemState,
+        _state: &[f64],
         residuals: &mut ResidualVector,
     ) -> Result<(), ComponentError> {
         for r in residuals.iter_mut() {
@@ -45,7 +45,7 @@ impl Component for SimpleAdapter {
 
     fn jacobian_entries(
         &self,
-        _state: &SystemState,
+        _state: &[f64],
         _jacobian: &mut JacobianBuilder,
     ) -> Result<(), ComponentError> {
         Ok(())