nx_train_triage.nx

nx_train_triage.nx -- TRAINING-DYNAMICS TRIAGE library (the team organ that handles what Claude diagnosed BY HAND during T4, 2026-06-10). Reads a machine-readable training report (TRIAGE-CLASS/TRIAGE-PRED/TRIAGE-ACC/TRIAGE-LOSS rows, emitted by training lanes like _t4b_closed_loop_authored) and NAMES the failure mode + the gate-proven fix, mechanically. The five lessons it encodes were each MEASURED on real failed gate runs: MAJORITY-COLLAPSE per-sample Adam on 88:2 imbalance -> all preds one class (88/149) POST-CONVERGENCE-BLOWUP constant-lr Adam after convergence: grads->0 => v->0 => mh/eps spike RARE-CLASS-LOSS unweighted loss loses exactly the smallest classes (util+mon) PLATEAU uncentered all-positive features froze relu nets across 3 optimizers CONVERGED-HEALTHY what T4/T4b look like when the lessons are applied Pure integer math on micro-loss values -- no f32 needed to judge a curve. RACI: Doctor owns the DIAGNOSIS verb here (names the heal); the Engineer owns the gate. LAWS: struct-free, flat ifs, no &&/||, loud verdicts. license_tier: ORIGINAL