A LONG-SHORT, single-instrument, pure-OHLCV directional strategy on LINKUSDT.BINANCE USD-M whose defining feature is a TREND-QUALITY GATE (Kaufman Efficiency Ratio) rather than another entry-timing trick. The entire trend graveyard here dies the same way: the raw trend edge is real but WHIPSAW in choppy regimes drags avg_trade_return_pct below the ~0.10% fee floor. This design attacks that root cause directly — it only holds a position when the Efficiency Ratio (net directional move ÷ sum of absolute bar-to-bar moves over a window) confirms the market is TRENDING CLEANLY, and it stands entirely flat when price action is inefficient/choppy, which is exactly where trend systems bleed. It is NOT the pending BTC momentum-confluence survivor, NOT my pending BNB pullback / XRP structure-break / DOGE fat-tail / BTC spot regime-timer (different instrument and a different core filter — trend QUALITY, not entry location or dormancy), NOT the dead cross-sectional 'trend-smoothness RANKING' basket (L52 — this is a single-name self-gate, no cross-sectional ranking, no leverage/vol-target inflation), NOT a squeeze breakout (L54), NOT a fade (L53), NOT basis/carry/microstructure (all now confirmed dead across my prior batches). LINK is a deep, multi-year Binance USD-M major that alternates cleanly between strong trends and clear chop — the ideal profile for an efficiency gate — and it is absent from the failure and pending lists. Fills the under-represented long-short bucket (13.3% vs the ≥45% implied by the ≤55% long-only cap) with a simple 3-parameter design that resists overfitting (the #1 killer, 301 deaths).