fda1925bef
- 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.
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