Add executed subsea-to-shore design and response-surface Colab notebook

README.md

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 * [Seismic acquisition to RMS-ready subsurface inputs](notebooks/reservoir/seismic_to_rms_input_workflow.ipynb) – Calculate CMP moveout and stacking, interpret public Reek seismic and wells, validate horizons and faults, screen seismic attributes, and export a checked RMS import package.
 * [RMS-origin reservoir to OPM Flow, ERT, and NeqSim](notebooks/reservoir/rms_to_opm_flow_agent_ert.ipynb) – Audit public Reek ROFF exports, demonstrate blocking and property spreading, run OPM Flow and ERT, and define a governed RMS-agent contract.
 
+* [Subsea-to-shore hydraulic design and response surfaces](notebooks/fluidflow/subsea_to_shore_response_surface_4253.ipynb) — Version 1.0.0, companion to equinor/neqsim#4253: 86 executed synthetic rate cases, Beggs–Brill/TwoFluidPipe comparison, held-out RSM qualification, mesh checks, a public-data adapter, and the verified flow-solve defect #4258. Source-pinned NeqSim master; results are retained inline.
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 ## Getting Started
 See the [NeqSim Colab page](https://colab.research.google.com/github/EvenSol/NeqSim-Colab/blob/master/notebooks/examples_of_NeqSim_in_Colab.ipynb) for how to start using NeqSim in Colab/Python.
 
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 * [Hydrocarbon phase evolution: NeqSim PVT to OPM Flow](notebooks/reservoir/hydrocarbon_phase_evolution_neqsim_opm.ipynb) — Companion to equinor/neqsim#4198: saturation-pressure temperature sensitivity, CME/CVD laboratory paths, an executed 300-cell black-oil reservoir, and a NeqSim surface process. Synthetic inputs; explicit limits on migration and compositional interpretation.
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notebooks/examples_of_NeqSim_in_Colab.ipynb

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     "* [Water-ammonia thermodynamics and generator screening](thermodynamics/water_ammonia_properties.ipynb): calculate pure-fluid references, binary equilibrium, composition and pressure sensitivities, EOS uncertainty, and a connected heater-separator generator workflow with recovery, carryover, and closure checks.\n",
     "\n",
     "## Fluid mechanics\n",
+    "* **Advanced — current master** - [Subsea-to-shore hydraulic design and response surfaces](fluidflow/subsea_to_shore_response_surface_4253.ipynb): compare Beggs–Brill, TwoFluidPipe and a homogeneous diagnostic; solve 86 pressure-constrained synthetic rate cases, fit and test quadratic/physics-informed surrogates, inspect mesh sensitivity, and reproduce the flow-solve termination defect in equinor/neqsim#4258. Companion to #4253; no experimental accuracy claim.\n",
     "* **Advanced — current master** - [Wellstream two- and three-phase flow: steady state, dynamics, hydrate and wax](fluidflow/wellstream_steady_dynamic_multiphase_master.ipynb): build NeqSim from master; inspect steady pressure, temperature, holdup and phase slip; run 120 s rate cycles with phase mass ledgers, mesh/time-step comparisons, time–distance maps and a saved animation; evaluate hydrate margins and a separately characterized wax-equilibrium screen; demonstrate bounded unsplit execution and transactional rollback.\n",
     "* [Fluid mechanics](fluidflow/FluidMechanics.ipynb)\n",
     "* [Natural-gas pipeline linepack and operational flexibility](fluidflow/natural_gas_pipeline_linepack.ipynb): combine NeqSim real-gas properties and native PipeBeggsAndBrills pressure profiles with inventory integration, pack/unpack transients, deliverability limits, and operating-margin checks.\n",
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