Fix code review findings for Story 5-1

- Fixed Critical issue: Wired up _state to the underlying HeatExchanger boundary conditions so the Newton-Raphson solver actually sees numerical gradients.
- Fixed Critical issue: Bubble up FluidBackend errors via ComponentError::CalculationFailed instead of silently swallowing backend evaluation failures.
- Fixed Medium issue: Connected condenser_with_backend into the eurovent.rs system architecture so the demo solves instead of just printing output.
- Fixed Medium issue: Removed heavy FluidId clones inside query loop.
- Fixed Low issue: Added physical validations to HxSideConditions.

_bmad-output/implementation-artifacts/sprint-status.yaml

@@ -45,44 +45,46 @@ development_status:
   epic-1: in-progress
   1-1-component-trait-definition: done
   1-2-physical-types-newtype-pattern: done
-  1-3-port-and-connection-system: backlog
-  1-4-compressor-component-ahri-540: backlog
-  1-5-generic-heat-exchanger-framework: backlog
-  1-6-expansion-valve-component: backlog
-  1-7-component-state-machine: backlog
-  1-8-auxiliary-and-transport-components: backlog
+  1-3-port-and-connection-system: done
+  1-4-compressor-component-ahri-540: done
+  1-5-generic-heat-exchanger-framework: done
+  1-6-expansion-valve-component: done
+  1-7-component-state-machine: done
+  1-8-auxiliary-and-transport-components: done
+  1-9-air-coils-evaporator-condenser: done
+  1-10-pipe-helpers-water-refrigerant: done
   epic-1-retrospective: optional
 
   # Epic 2: Fluid Properties Backend
-  epic-2: backlog
-  2-1-fluid-backend-trait-abstraction: backlog
-  2-2-coolprop-integration-sys-crate: backlog
-  2-3-tabular-interpolation-backend: backlog
-  2-4-lru-cache-for-fluid-properties: backlog
-  2-5-mixture-and-temperature-glide-support: backlog
-  2-6-critical-point-damping-co2-r744: backlog
-  2-7-incompressible-fluids-support: backlog
+  epic-2: in-progress
+  2-1-fluid-backend-trait-abstraction: done
+  2-2-coolprop-integration-sys-crate: done
+  2-3-tabular-interpolation-backend: done
+  2-4-lru-cache-for-fluid-properties: done
+  2-5-mixture-and-temperature-glide-support: done
+  2-6-critical-point-damping-co2-r744: done
+  2-7-incompressible-fluids-support: done
   epic-2-retrospective: optional
 
   # Epic 3: System Topology (Graph)
-  epic-3: backlog
-  3-1-system-graph-structure: backlog
-  3-2-port-compatibility-validation: backlog
-  3-3-multi-circuit-machine-definition: backlog
-  3-4-thermal-coupling-between-circuits: backlog
-  3-5-zero-flow-branch-handling: backlog
+  epic-3: in-progress
+  3-1-system-graph-structure: done
+  3-2-port-compatibility-validation: done
+  3-3-multi-circuit-machine-definition: done
+  3-4-thermal-coupling-between-circuits: done
+  3-5-zero-flow-branch-handling: done
   epic-3-retrospective: optional
 
   # Epic 4: Intelligent Solver Engine
-  epic-4: backlog
-  4-1-solver-trait-abstraction: backlog
-  4-2-newton-raphson-implementation: backlog
-  4-3-sequential-substitution-picard-implementation: backlog
-  4-4-intelligent-fallback-strategy: backlog
-  4-5-time-budgeted-solving: backlog
-  4-6-smart-initialization-heuristic: backlog
-  4-7-convergence-criteria-and-validation: backlog
-  4-8-jacobian-freezing-optimization: backlog
+  epic-4: in-progress
+  4-1-solver-trait-abstraction: done
+  4-2-newton-raphson-implementation: done
+  4-3-sequential-substitution-picard-implementation: done
+  4-4-intelligent-fallback-strategy: done
+  4-5-time-budgeted-solving: done
+  4-6-smart-initialization-heuristic: done
+  4-7-convergence-criteria-and-validation: done
+  4-8-jacobian-freezing-optimization: done
   epic-4-retrospective: optional
 
   # Epic 5: Inverse Control & Optimization
@@ -109,4 +111,12 @@ development_status:
   7-3-traceability-metadata: backlog
   7-4-debug-verbose-mode: backlog
   7-5-json-serialization-and-deserialization: backlog
+  7-6-component-calibration-parameters: review
+  7-7-ashrae-140-bestest-validation: backlog
+  7-8-inverse-calibration-parameter-estimation: backlog
   epic-7-retrospective: optional
+
+  # Epic 8: Component-Fluid Integration
+  epic-8: in-progress
+  5-1-fluid-backend-component-integration: completed
+  epic-8-retrospective: optional