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fortran/witness_seed_3.0_quickstart.md

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+# Witness Seed 3.0 Quickstart
+
+## Prerequisites
+- Fortran compiler (e.g., gfortran, mpif90)
+- MPI library (e.g., OpenMPI)
+- Optional: NetCDF for climate data output
+
+## Setup
+1. Clone the repository: `git clone <repo-url>`
+2. Navigate to `fortran/witness_seed_3.0`
+3. Run `make` to compile: `make`
+
+## Run
+Execute the model: `mpirun -np 4 ./witness_seed_3.0`
+
+## Output
+Predictions are printed every 1000 steps. Future versions will write to `data/` in NetCDF format.
+
+## Test
+Run unit tests: `make test`
+
+See [README.md](README.md) for the full vision.