Create data/train.csv

data/train.csv

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+id,reactor_type,burnup_gwdt,linear_heat_kw_m,pellet_temp_c,cladding_temp_c,creep_rate_pct_hr,fgr_pct,drift_gradient,failure_risk_score,failure_horizon_cycles,mitigation_action,gold_route,notes
+FFR-001,PWR,38,24,1130,400,0.014,1.9,0.09,0.42,220,"continue monitoring","monitor","Stable but trending"
+FFR-002,PWR,45,26,1200,420,0.021,2.6,0.14,0.63,120,"reduce power 5%","power_reduction","Mid-risk drift"
+FFR-003,PWR,50,27,1260,440,0.025,3.1,0.18,0.79,60,"power reduction + inspection","dual","High burnup risk"
+FFR-004,BWR,34,22,1105,380,0.012,1.8,0.08,0.37,240,"continue monitoring","monitor","Coherent state"
+FFR-005,BWR,41,23,1185,405,0.017,2.3,0.12,0.58,150,"power reduction","power_reduction","Rising mismatch"
+FFR-006,SMR,18,17,910,325,0.005,0.6,0.02,0.12,400,"none","stable","Baseline SMR"
+FFR-007,SMR,40,23,1120,405,0.018,2.3,0.12,0.55,180,"reduce power","power_reduction","Late-cycle drift"
+FFR-008,PWR,55,28,1300,455,0.030,3.8,0.21,0.88,40,"shutdown inspection","shutdown","Critical horizon"
+FFR-009,PWR,30,21,1050,370,0.009,1.3,0.05,0.28,300,"continue monitoring","monitor","Healthy coupling"
+FFR-010,BWR,48,25,1220,430,0.020,2.9,0.16,0.71,90,"reduce power + inspect","dual","Escalating"