Add Skyhook (SKH01_V2_DD) as a portfolio sleeve. Effective weight 25%: the three
existing sleeves scaled into the remaining 0.75 keeping their 55:25:20 ratio
(TP01 41.25% / XS01 18.75% / VRP01 15% / SKH01 25%).
_skyhook_returns(): 50/50 BTC+ETH daily series of the dual-TF regime+breakout engine
(causal, net 0.10% RT), same convention as the marginal lens.
Portfolio impact (run_portfolio.py), 3-sleeve -> 4-sleeve:
FULL Sharpe 1.68 -> 2.13 (+0.45), FULL maxDD 14.3% -> 7.8% (halved)
HOLD-OUT Sharpe 1.63 -> 2.30 (+0.67), HOLD-OUT maxDD ~3.5% (flat)
Positive every year 2019-26 (annual DD <=7.8%) vs buy&hold 50/50 FULL Sh 0.93 / DD 76%.
Skyhook is quasi-orthogonal (corr ~0.09 to TP01) so it lifts Sharpe AND cuts DD.
Research portfolio (fixed weights, no real rebalancing cost at $600; Skyhook daily
Sharpe is the step-marked lens convention) -> forward-monitor, not deploy.
Tests: 25 pass (skyhook 8 + portfolio 7 + vrp 4 + trend 6). Diary + CLAUDE.md updated.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Adriano Dal Pastro
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