SIMD Refactor: Merge simd-dev into dev (#55)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: aider (openrouter/anthropic/claude-sonnet-4) <aider@aider.chat>
Co-authored-by: Warp <agent@warp.dev>

lib/volatility/atr/atr.pine

@@ -0,0 +1,40 @@
+// The MIT License (MIT)
+// © mihakralj
+//@version=6
+indicator("Average True Range (ATR)", "ATR", overlay=false)
+
+//@function Calculates the Average True Range (ATR)
+//@param length The period length for the ATR calculation.
+//@returns The ATR value.
+//@optimized Beta precomputation for RMA warmup compensation
+atr(simple int length) =>
+    if length <= 0
+        runtime.error("Period must be greater than 0")
+    var float prevClose = close
+    float tr1 = high - low
+    float tr2 = math.abs(high - prevClose)
+    float tr3 = math.abs(low - prevClose)
+    float trueRange = math.max(tr1, tr2, tr3)
+    prevClose := close
+    float alpha = 1.0 / float(length)
+    float beta = 1.0 - alpha
+    var float EPSILON = 1e-10
+    var float raw_rma = 0.0
+    var float e = 1.0
+    if not na(trueRange)
+        raw_rma := (raw_rma * (length - 1) + trueRange) / length
+        e *= beta
+        e > EPSILON ? raw_rma / (1.0 - e) : raw_rma
+    else
+        na
+
+// ---------- Main loop ----------
+
+// Inputs
+i_length = input.int(14, "Length", minval=1, tooltip="Number of bars used for the ATR calculation")
+
+// Calculation
+atrValue = atr(i_length)
+
+// Plot
+plot(atrValue, "ATR", color=color.yellow, linewidth=2)