[H-spy-1d-weekday-effect] REFUTED — across 2007–2026, Wednesdays beat other SPY days by only +0.024%/day (p=0.29, not significant); this strategy lost 6.9% vs buy-and-hold +2.1% in 2021–23 after costs. Running as a paper forward test. Holds SPY from Tuesday's close to Wednesday's close; flat otherwise.
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