Create data/train.csv

data/train.csv

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+id,reactor_type,salt_system,temperature_c,redox_potential_mv,fission_product_load_index,alloy_type,measured_corrosion_rate_um_per_year,baseline_coherence_index,expected_corrosion_rate_band,redox_stability_band,chemistry_balance_state,notes,constraints,gold_check
+MSR-001,MSR,LiF-BeF2-UF4,650,-420,0.12,Hastelloy-N,8,0.92,5-10um,stable,reduced,"Nominal operation","under 320 words","coherence"
+MSR-002,MSR,LiF-BeF2-UF4,680,-390,0.18,Hastelloy-N,12,0.88,8-15um,stable,reduced,"Slight FP increase","under 320 words","coherence"
+MSR-003,MSR,NaF-ZrF4-UF4,700,-350,0.25,Ni-alloy,18,0.81,15-25um,moderate,balanced,"Higher temp load","under 320 words","coherence"
+MSR-004,MSR,LiF-BeF2-ThF4,640,-430,0.10,Hastelloy-N,6,0.95,4-8um,stable,reduced,"Thorium cycle","under 320 words","coherence"
+MSR-005,MSR,NaF-KF-UF4,720,-300,0.30,Ni-alloy,25,0.74,20-35um,edge,oxidizing,"High FP load","under 320 words","coherence"
+MSR-006,MSR,LiF-BeF2-UF4,660,-410,0.15,Hastelloy-N,9,0.91,6-12um,stable,reduced,"Nominal drift","under 320 words","coherence"
+MSR-007,MSR,NaF-ZrF4-UF4,710,-330,0.28,Ni-alloy,22,0.79,18-28um,moderate,balanced,"ZrF4 variant","under 320 words","coherence"
+MSR-008,MSR,LiF-BeF2-UF4,675,-405,0.14,Hastelloy-N,10,0.89,8-12um,stable,reduced,"Slight oxidation","under 320 words","coherence"
+MSR-009,MSR,LiF-BeF2-ThF4,650,-440,0.09,Hastelloy-N,5,0.96,3-7um,stable,reduced,"Low FP load","under 320 words","coherence"
+MSR-010,MSR,NaF-KF-UF4,730,-290,0.35,Ni-alloy,30,0.70,25-40um,edge,oxidizing,"High temp stress","under 320 words","coherence"