X1 learning-rate ablation arm (lr = 4e-6) of the TaskTrove hyperparameter sweep.

TERMINATED by owner at step 36/80 after reward collapsed to exactly 0.000 at steps 33-36 (a hard collapse, not the gradual decay expected from an over-large learning rate). This is not a completed / valid X1 result: it did not reach its 80-step horizon. Selected checkpoint = global_step_30, the trailing-5 EMA peak (0.1700) among saved exports and the last healthy checkpoint before the step-33 collapse. See training_logs/report.md for the full curve.

Companion trial-level trace dataset: https://huggingface.co/datasets/open-athena/tt-x1_lr-lr4e6

Per-step metric surface, the parse_skyrl_metrics.py analysis report, and the reward plot (metrics.csv, report.md, reward_plot.png).