Quando iv_minus_rv_adaptive_enabled=True, la soglia diventa
max(P_q rolling, iv_minus_rv_min). Path legacy (statico) e
None-bypass restano invariati.
Aggiunge anche due model_validator a StrategyConfig per
fail-fast su config invalida (window_min_days < target_days,
percentile in (0,1)) — risponde alla code review T1.
Tests: pass/skip su rolling, warmup hard, floor binding,
backwards compat statico, None bypass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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