fix: resolve build and test errors

- Sar.Quantower.Tests.cs: add missing opening quote on string literal (line 48)
- Exports.cs: rename Correlation.Batch → Correl.Batch (CS0103)
- Ad.Validation.Tests.cs: fix Ooples OutputValues key "Ad" → "Adl"

lib/volume/ad/ad.pine

@@ -0,0 +1,28 @@
+// Licensed under the Apache License, Version 2.0
+// © mihakralj
+//@version=6
+indicator("Accumulation/Distribution Line (AD)", "AD", overlay=false)
+
+//@function Calculates the Accumulation/Distribution Line (AD), a volume-based indicator that measures money flow into and out of a security
+//@param src_high The high price (default: built-in high)
+//@param src_low The low price (default: built-in low)
+//@param src_close The close price (default: built-in close)
+//@param src_vol The volume (default: built-in volume)
+//@returns The cumulative AD value representing buying/selling pressure
+ad(src_high = high, src_low = low, src_close = close, src_vol = volume) =>
+    float mfm = 0.0
+    if not na(src_high) and not na(src_low) and not na(src_close)
+        mfm := (src_close - src_low) - (src_high - src_close)
+        mfm := src_high != src_low ? mfm / (src_high - src_low) : 0.0
+    float mfv = na(src_vol) ? 0.0 : src_vol * mfm
+    var float cumulativeSum = 0.0
+    cumulativeSum := na(mfv) ? cumulativeSum : cumulativeSum + mfv
+    cumulativeSum
+
+// ---------- Inputs ----------
+
+// ---------- Calculations ----------
+ad_val = ad(high, low, close, volume)
+
+// ---------- Plotting ----------
+plot(ad_val, "AD", color=color.yellow, linewidth=2)