feat(components): add BphxExchanger with geometry-based heat transfer correlations (Story 11.5)

- Add BphxGeometry with builder pattern for plate heat exchanger specs
- Implement 6 heat transfer correlations: Longo2004, Shah1979/2021, Kandlikar1990, GungorWinterton1986, Gnielinski1976
- Add CorrelationSelector with validity range checking
- Add compute_pressure_drop() using Calib.f_dp
- Implement HeatTransferCorrelation trait for BphxCorrelation
- 45 BPHX tests + 17 correlation tests passing

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

@@ -1,5 +1,5 @@
 # Sprint Status - Entropyk
-# Last Updated: 2026-02-22
+# Last Updated: 2026-02-24
 # Project: Entropyk
 # Project Key: NOKEY
 # Tracking System: file-system
@@ -110,7 +110,7 @@ development_status:
   7-1-mass-balance-validation: done
   7-2-energy-balance-validation: done
   7-3-traceability-metadata: review
-  7-4-debug-verbose-mode: backlog
+  7-4-debug-verbose-mode: done
   7-5-json-serialization-deserialization: backlog
   7-6-component-calibration-parameters-calib: backlog
   7-7-ashrae-140-bestest-validation-post-mvp: backlog
@@ -133,28 +133,28 @@ development_status:
   9-5-flowsplitterflowmerger-energy-methods: done
   9-6-energy-validation-logging-improvement: done
   9-7-solver-refactoring-split-files: done
-  9-8-systemstate-dedicated-struct: review
+  9-8-systemstate-dedicated-struct: done
   epic-9-retrospective: optional
 
   # Epic 10: Enhanced Boundary Conditions
   # Refactoring of FlowSource/FlowSink for typed fluid support
   # See: _bmad-output/planning-artifacts/epic-10-enhanced-boundary-conditions.md
-  epic-10: backlog
-  10-1-new-physical-types: backlog
-  10-2-refrigerant-source-sink: backlog
-  10-3-brine-source-sink: backlog
-  10-4-air-source-sink: backlog
-  10-5-migration-deprecation: backlog
+  epic-10: in-progress
+  10-1-new-physical-types: done
+  10-2-refrigerant-source-sink: done
+  10-3-brine-source-sink: done
+  10-4-air-source-sink: done
+  10-5-migration-deprecation: done
   10-6-python-bindings-update: backlog
   epic-10-retrospective: optional
 
   # Epic 11: Advanced HVAC Components
   epic-11: in-progress
   11-1-node-passive-probe: done
-  11-2-drum-recirculation-drum: ready-for-dev
-  11-3-floodedevaporator: backlog
-  11-4-floodedcondenser: backlog
-  11-5-bphxexchanger-base: backlog
+  11-2-drum-recirculation-drum: done
+  11-3-floodedevaporator: done
+  11-4-floodedcondenser: done
+  11-5-bphxexchanger-base: in-progress
   11-6-bphxevaporator: backlog
   11-7-bphxcondenser: backlog
   11-8-correlationselector: backlog
@@ -166,3 +166,30 @@ development_status:
   11-14-danfoss-parser: ready-for-dev
   11-15-bitzer-parser: ready-for-dev
   epic-11-retrospective: optional
+
+  # Epic 12: CLI Refactor & Advanced Components
+  # Support for ScrewEconomizerCompressor, MCHXCondenserCoil, FloodedEvaporator
+  # with proper internal state variables, CoolProp backend, and controls
+  epic-12: in-progress
+  12-1-cli-internal-state-variables: ready-for-dev
+  12-2-cli-coolprop-backend: ready-for-dev
+  12-3-cli-screw-compressor-config: ready-for-dev
+  12-4-cli-mchx-condenser-config: ready-for-dev
+  12-5-cli-flooded-evaporator-brine: ready-for-dev
+  12-6-cli-control-constraints: ready-for-dev
+  12-7-cli-output-json-metrics: ready-for-dev
+  12-8-cli-batch-improvements: ready-for-dev
+  epic-12-retrospective: optional
+
+  # Epic 13: Rust API Enhancements
+  # Extending SystemBuilder with multi-circuit, constraints, thermal couplings,
+  # structured results, JSON config, and fluid backend assignment
+  epic-13: in-progress
+  13-1-systembuilder-multi-circuit: ready-for-dev
+  13-2-systembuilder-port-validated-edges: ready-for-dev
+  13-3-systembuilder-constraints-api: ready-for-dev
+  13-4-systembuilder-thermal-couplings: ready-for-dev
+  13-5-simulation-result-structured: ready-for-dev
+  13-6-json-config-serialize: ready-for-dev
+  13-7-fluid-backend-assignment: ready-for-dev
+  epic-13-retrospective: optional