nx_fin_paper.nx

nx_fin_paper.nx -- R5: PAPER / forward simulation = the OVERFIT CHECK before any capital. Splits the bar history into in-sample (train) vs OUT-OF-SAMPLE (test), replays the strategy signals through the R2 engine on the OOS slice ONLY, and asks the honest question: does the edge SURVIVE on data it never saw? An edge that only works in-sample is overfit -- this is the gate before R6 live. Composes R1 (MD_FIELDS) + R2 (bt_run). license_tier: ORIGINAL