feat(ao-histogram): add Awesome Oscillator Histogram

AO - SMA(AO, sma_period). A configurable variant of the existing
AcceleratorOscillator (which fixes fast=5, slow=34, sma=5).
Three parameters; defaults match Bill Williams' Accelerator.

Touchpoints: awesome_oscillator_histogram.rs + mod.rs + lib.rs
re-export, PyAoHist + __init__.py + test_new_indicators CANDLE_SCALAR
+ test_known_values flat reference, AwesomeOscillatorHistogramNode +
index.d.ts/index.js + indicators.test.js factory + reference,
WasmAoHist, candle-fuzz target, README + CHANGELOG.

bindings/wasm/src/lib.rs

@@ -1902,6 +1902,47 @@ impl WasmRollingVwap {
     }
 }
 
+#[wasm_bindgen(js_name = AwesomeOscillatorHistogram)]
+pub struct WasmAoHist {
+    inner: wc::AwesomeOscillatorHistogram,
+}
+
+#[wasm_bindgen(js_class = AwesomeOscillatorHistogram)]
+impl WasmAoHist {
+    #[wasm_bindgen(constructor)]
+    pub fn new(fast: usize, slow: usize, sma_period: usize) -> Result<WasmAoHist, JsError> {
+        Ok(Self {
+            inner: wc::AwesomeOscillatorHistogram::new(fast, slow, sma_period).map_err(map_err)?,
+        })
+    }
+    pub fn update(&mut self, high: f64, low: f64) -> Result<Option<f64>, JsError> {
+        let c = make_candle(high, low, low, 0.0)?;
+        Ok(self.inner.update(c))
+    }
+    pub fn batch(&mut self, high: &[f64], low: &[f64]) -> Result<Float64Array, JsError> {
+        if high.len() != low.len() {
+            return Err(JsError::new("high and low must be equal length"));
+        }
+        let mut out = Vec::with_capacity(high.len());
+        for i in 0..high.len() {
+            let c = make_candle(high[i], low[i], low[i], 0.0)?;
+            out.push(self.inner.update(c).unwrap_or(f64::NAN));
+        }
+        Ok(Float64Array::from(out.as_slice()))
+    }
+    pub fn reset(&mut self) {
+        self.inner.reset();
+    }
+    #[wasm_bindgen(js_name = isReady)]
+    pub fn is_ready(&self) -> bool {
+        self.inner.is_ready()
+    }
+    #[wasm_bindgen(js_name = warmupPeriod)]
+    pub fn warmup_period(&self) -> usize {
+        self.inner.warmup_period()
+    }
+}
+
 #[wasm_bindgen(js_name = AwesomeOscillator)]
 pub struct WasmAo {
     inner: wc::AwesomeOscillator,