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>

quantower/lib/accbands.pine

@@ -0,0 +1,64 @@
+// The MIT License (MIT)
+// © mihakralj
+//@version=6
+indicator("Acceleration Bands (ACCBANDS)", "ACCBANDS", overlay=true)
+
+//@function Calculates Acceleration Bands using SMAs of high, low, close prices
+//@param high Series of high prices
+//@param low Series of low prices
+//@param close Series of close prices
+//@param period Lookback period for the moving average
+//@param factor Multiplier for band width calculation
+//@returns tuple with [middle, upper, lower] band values
+//@optimized Uses circular buffers with O(1) complexity per bar
+accbands(series float high, series float low, series float close, simple int period, simple float factor = 2.0) =>
+    if period <= 0 or factor <= 0.0
+        runtime.error("Period and factor must be greater than 0")
+    var int p = math.max(1, period)
+    var int head = 0
+    var int count = 0
+    var array<float> bufferHigh = array.new_float(p, na)
+    var array<float> bufferLow = array.new_float(p, na)
+    var array<float> bufferClose = array.new_float(p, na)
+    var float sumHigh = 0.0
+    var float sumLow = 0.0
+    var float sumClose = 0.0
+    float oldestHigh = array.get(bufferHigh, head)
+    float oldestLow = array.get(bufferLow, head)
+    float oldestClose = array.get(bufferClose, head)
+    if not na(oldestHigh)
+        sumHigh -= oldestHigh
+        sumLow -= oldestLow
+        sumClose -= oldestClose
+        count -= 1
+    float currentHigh = nz(high)
+    float currentLow = nz(low)
+    float currentClose = nz(close)
+    sumHigh += currentHigh
+    sumLow += currentLow
+    sumClose += currentClose
+    count += 1
+    array.set(bufferHigh, head, currentHigh)
+    array.set(bufferLow, head, currentLow)
+    array.set(bufferClose, head, currentClose)
+    head := (head + 1) % p
+    float smaHigh = nz(sumHigh / count)
+    float smaLow = nz(sumLow / count)
+    float smaClose = nz(sumClose / count)
+    float bandWidth = (smaHigh - smaLow) * factor
+    [smaClose, smaHigh + bandWidth, smaLow - bandWidth]
+
+// ---------- Main loop ----------
+
+// Inputs
+i_period = input.int(20, "Period", minval=1)
+i_factor = input.float(2.0, "Factor", minval=0.001)
+
+// Calculation
+[middle, upper, lower] = accbands(high, low, close, i_period, i_factor)
+
+// Plot
+plot(middle, "Middle", color=color.yellow, linewidth=2)
+p1 = plot(upper, "Upper", color=color.yellow, linewidth=2)
+p2 = plot(lower, "Lower", color=color.yellow, linewidth=2)
+fill(p1, p2, color=color.new(color.blue, 90), title="Band Fill")