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/volume/pvi/pvi.pine

@@ -0,0 +1,27 @@
+// The MIT License (MIT)
+// © mihakralj
+//@version=6
+indicator("Positive Volume Index (PVI)", "PVI", overlay=false)
+
+//@function Calculates Positive Volume Index, tracks price changes on days with higher volume
+//@doc https://github.com/mihakralj/pinescript/blob/main/indicators/volume/pvi.md
+//@param src Price series to use for calculation
+//@param vol Volume series
+//@param start_value Starting value for PVI (typically 100 or 1000)
+//@returns float The PVI value
+pvi(series float src, series float vol = volume, simple float start_value = 100.0) =>
+    var float pvi_value = start_value
+    if not (na(src) or na(vol) or na(src[1]) or na(vol[1]) or src[1] == 0.0 or vol[1] <= 0.0) and vol > vol[1]
+        pvi_value := pvi_value * src / src[1]
+    pvi_value
+
+// ---------- Main Calculation ----------
+
+// Parameters
+src = input.source(close, "Price Source")
+
+// Calculations
+pvi_line = pvi(src, volume)
+
+// Plot
+plot(pvi_line, "PVI", color=color.yellow, linewidth=2)