Task 24
Earnings Contagion → Strategy → BacktestEnter bellwether, peer (first reports, second is traded). When the bellwether's earnings hit, the read-across moves the peer before the peer reports its own numbers. We classify the bellwether's 8-K earnings (reusing Task 8) and trade the peer in the short window after — keyed to the bellwether's filing date, so it's lookahead-free. Read-across is a short, decaying drift.