Skills
Mastery is progressive: level 1 = 6 validation / 8 test arenas, level 2 = 12 / 16, level 3 = 24 / 32. A level passes at 100% / 100% / 95% physics validation and at least 95% in the surrogate. Optimal means level 3 is passed and the brain scores at least 90% on the 32 held-out test arenas. Validation arenas pick the brain; test arenas never do (they only decide when to stop). Success is strict: seeking skills must reach within 1.5 mm and stand still on the target, and escapes must gain 6 mm without first stepping toward the source.
Training curves
Event timeline
Engineering log: making skills survive the jump to physics
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