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Josh Creek
e1f512c94e
Hard has been a label-only duplicate of medium.json since medium was promoted on 2026-08-17. Promote 20260823-1734-gen5-s5-intercepts-retry2 into hard.json so the tier is a genuinely distinct policy, and so the strongest bot the curriculum has produced survives the next round's checkpoint pruning — promoted files are never touched by training scripts. Stage 5 blocked after three attempts, so like medium.json this comes from a run recorded as decision: "fail". Both failing floors are covered in TRAINING.md: goal_rate 0.7369 vs 0.75 is marginal, and productive_air_touch_fraction 0.0001 vs 0.005 is a bar no policy in the lineage has approached, against a metric quantised at 0.01 per ~100-episode window. On every other axis it is the best yet: upright_fraction 0.757 against a 0.40 floor that the pre-Round-6 lineage never pushed past 0.331, and forward_motion_fraction 0.479 against 0.20. Chosen over attempt 2 (retry1) on a tiebreak, not a margin. retry1 posts a much wider indirect result against medium.json (63-23-14 vs 47-32-21), but a direct 100-episode head-to-head between the two finished 36-39 with 25 draws, so that gap does not reflect a real strength difference. Attempt 3 is the later checkpoint (it resumed from attempt 2) and edges every telemetry metric. Verified: hard.json is byte-identical to its source export, matches easy/medium on input_size 83, 3 layers and action space, and beats medium.json 19-7-4 in a fresh 30-episode paired run. Tiers stay monotonic: hard > medium > easy. That head-to-head also showed a 17% physical side imbalance (physical teams 0-1 = 29-46), reproduced at 13% in the 30-episode check. Inside the 20% bar used elsewhere and equal across both models, but noted in TRAINING.md as worth investigating rather than assuming variance.
