schedopt-v3-tails

Phase A of the v3 campaign. Before any search spends compute, this node establishes the empirical ground the new objective stands on: extract per-seed crossing times from the existing v1/v2 trajectories, run a reference panel of seven arms to a long horizon so the right tail is actually observed rather than censored at 350 steps, test whether the fixed-concentration baseline's time-to-generalization distribution is heavy-tailed, bimodal, or merely shifted, and calibrate the frozen operating point — the threshold, the horizon, and the instrument — by a pre-registered discrimination criterion computed on calibration seeds only. The phase gate decides the campaign's framing: tail truncation if the tail is real, median speed if it is not.