spec: Phase 2 regime awareness — ISV_DIM 8→12, cross-regime adaptation
4 new ISV signals: regime_velocity (d(ADX)/dt + d(CUSUM)/dt),
regime_disagreement (|norm_ADX - norm_CUSUM|), regime_transition_ema,
regime_stability (1 - sigmoid(5*velocity)).
Pearls: P4 regime velocity, P5 regime disagreement.
Gems: G4 regime-aware ISV, G5 soft regime mixture.
Novels: N6 cross-regime Mamba2 decay, N7 regime-conditioned gamma.
Tasks 10-13 added for Phase 2 implementation after core ISV.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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