Coil Scan — dual-timeframe %R Trend Exhaustion

Mirrors the "%R Trend Exhaustion [upslidedown]" TradingView indicator (dual timeframe 21 + 112). Finds stocks that are both deeply oversold AND just starting to reverse.

The indicator math

• %R(n) = Williams %R = 100 * (close - highestHigh_n) / (highestHigh_n - lowestLow_n), range −100…0.
• Fast leg = EMA(7) of %R(21).
• Slow leg = EMA(3) of %R(112).
• Threshold (TH) = −80.
• In the coil: both fast AND slow ≤ −80. The short-term AND the structural picture are both deeply oversold. This is the stalk zone — a name can sit here for days/weeks before the trigger fires.
• Triggered out: fast crossed back above −80 while it was recently (within ~20 bars) coiled on both legs. The slow leg still lagging confirms the structural exhaustion hasn't reset — this is the bullish reversal signal.