A LONG-SHORT, single-instrument, pure-OHLCV, regime-aware trend follower on SOLUSDT.BINANCE (USD-M perpetual), 4H bars. It belongs to the ONLY mechanism family that has ever reached paper-stage in this factory (single-instrument 4H long-short directional momentum with a confirmation GATE — BTC/ETH/ADA all survived), but it uses a DELIBERATELY DIFFERENT gate from the volume-confirmed and dual-timeframe siblings already in the pipeline, so it is not a duplicate. Core insight: 4H crypto trend-following bleeds to death in low-volatility CHOP (whipsaw round-trips whose moves are smaller than fees — the exact grave that killed DOT vol-compression-squeeze and every intraday reversion variant), and makes its money almost entirely during volatility-EXPANSION phases when a genuine directional move is underway. So instead of trying to detect a coil and predict the breakout direction (the DOT squeeze approach that died), this strategy is agnostic about compression and only ever engages once volatility is DEMONSTRABLY expanding AND price already has an established trend sign — it rides the move that has already begun rather than guessing. Sign of trend = sign of the N-bar rate-of-change (a single trend lookback). Volatility-expansion gate = ATR(fast) / ATR(slow) above a threshold, i.e. short-window realized range is running hot relative to its own baseline (a real move, not drift). When the gate is OFF (vol contracting / ranging), the strategy is FLAT — this is the whole edge: it structurally refuses to trade the fee-graveyard chop regime that killed the failures. Exactly 3 parameters: trend_lookback, vol_ratio_threshold, atr_trail_mult. Single instrument (no basket — avoids the multi_instrument 0/127 backtest_failed crashes), single venue (no cross-venue basis to drift). This is regime-aware, long-short (an under-represented direction at 14.2% of the portfolio), and low-parameter (overfit-resistant).