Inferential validation (defend against false discovery at sweep scale)

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The World's massively parallel sweep (C12) is aura's differentiator, and it is also the most direct route to false discovery: selecting the best of a large family, picking sharp in-sample peaks, and confirming an edge on a single series all manufacture apparent edges out of noise. The hygiene invariants (C1 determinism, C2 no look-ahead) keep a single backtest honest; this milestone adds the inferential layer that keeps a selection across a family honest.

Walk-forward and the per-candidate out-of-sample bootstrap confidence interval are tracked in #139. This milestone covers the defenses #139 leaves unguarded: trials-deflation of the selected winner, plateau-over-peak selection, and cross-instrument generalization.

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