F4: add StochRSI and Ultimate Oscillator

Completes the F4 family (Stochastic oscillators) end to end:

- Rust core: stoch_rsi.rs (Stochastic Oscillator applied to the RSI
  series, bounded [0,100]) and ultimate_oscillator.rs (Larry Williams'
  weighted three-timeframe buying-pressure oscillator). Each with a full
  Indicator impl, runnable doctest and reference / saturation / bounds /
  warmup / reset / batch==streaming tests.
- Python: PyStochRsi / PyUltimateOscillator PyO3 classes + module
  registration + .pyi stubs (defaults StochRSI=(14,14), UO=(7,14,28)).
- Node: explicit StochRsiNode and UltimateOscillatorNode; index.d.ts
  and index.js updated.
- WASM: WasmStochRsi via the scalar macro, explicit
  WasmUltimateOscillator.
- Wiki: Indicator-StochRsi.md and Indicator-UltimateOscillator.md plus
  rows in Indicators-Overview.md and entries in Home.md.

cargo fmt + clippy (core/wickra/data/wasm/node) clean; 278 core tests,
25 data tests and 39 doctests green.

bindings/node/index.js

@@ -310,7 +310,7 @@ if (!nativeBinding) {
   throw new Error(`Failed to load native binding`)
 }
 
-const { version, SMA, EMA, WMA, RSI, DEMA, TEMA, HMA, ROC, TRIX, SMMA, TRIMA, ZLEMA, T3, VWMA, MOM, CMO, TSI, PMO, MACD, BollingerBands, ATR, Stochastic, OBV, ADX, CCI, WilliamsR, MFI, PSAR, Keltner, Donchian, VWAP, AwesomeOscillator, Aroon, KAMA } = nativeBinding
+const { version, SMA, EMA, WMA, RSI, DEMA, TEMA, HMA, ROC, TRIX, SMMA, TRIMA, ZLEMA, T3, VWMA, MOM, CMO, TSI, PMO, StochRSI, UltimateOscillator, MACD, BollingerBands, ATR, Stochastic, OBV, ADX, CCI, WilliamsR, MFI, PSAR, Keltner, Donchian, VWAP, AwesomeOscillator, Aroon, KAMA } = nativeBinding
 
 module.exports.version = version
 module.exports.SMA = SMA
@@ -331,6 +331,8 @@ module.exports.MOM = MOM
 module.exports.CMO = CMO
 module.exports.TSI = TSI
 module.exports.PMO = PMO
+module.exports.StochRSI = StochRSI
+module.exports.UltimateOscillator = UltimateOscillator
 module.exports.MACD = MACD
 module.exports.BollingerBands = BollingerBands
 module.exports.ATR = ATR

bindings/node/src/lib.rs

@@ -1144,6 +1144,100 @@ impl PmoNode {
 
 // ============================== VWMA ==============================
 
+// ============================== StochRSI ==============================
+
+#[napi(js_name = "StochRSI")]
+pub struct StochRsiNode {
+    inner: wc::StochRsi,
+}
+
+#[napi]
+impl StochRsiNode {
+    #[napi(constructor)]
+    pub fn new(rsi_period: u32, stoch_period: u32) -> napi::Result<Self> {
+        Ok(Self {
+            inner: wc::StochRsi::new(rsi_period as usize, stoch_period as usize)
+                .map_err(map_err)?,
+        })
+    }
+    #[napi]
+    pub fn update(&mut self, value: f64) -> Option<f64> {
+        self.inner.update(value)
+    }
+    #[napi]
+    pub fn batch(&mut self, prices: Vec<f64>) -> Vec<f64> {
+        flatten(self.inner.batch(&prices))
+    }
+    #[napi]
+    pub fn reset(&mut self) {
+        self.inner.reset();
+    }
+    #[napi(js_name = "isReady")]
+    pub fn is_ready(&self) -> bool {
+        self.inner.is_ready()
+    }
+    #[napi(js_name = "warmupPeriod")]
+    pub fn warmup_period(&self) -> u32 {
+        self.inner.warmup_period() as u32
+    }
+}
+
+// ============================== Ultimate Oscillator ==============================
+
+#[napi(js_name = "UltimateOscillator")]
+pub struct UltimateOscillatorNode {
+    inner: wc::UltimateOscillator,
+}
+
+#[napi]
+impl UltimateOscillatorNode {
+    #[napi(constructor)]
+    pub fn new(short: u32, mid: u32, long: u32) -> napi::Result<Self> {
+        Ok(Self {
+            inner: wc::UltimateOscillator::new(short as usize, mid as usize, long as usize)
+                .map_err(map_err)?,
+        })
+    }
+    #[napi]
+    pub fn update(&mut self, high: f64, low: f64, close: f64) -> napi::Result<Option<f64>> {
+        Ok(self.inner.update(cnd(high, low, close, 0.0)?))
+    }
+    #[napi]
+    pub fn batch(
+        &mut self,
+        high: Vec<f64>,
+        low: Vec<f64>,
+        close: Vec<f64>,
+    ) -> napi::Result<Vec<f64>> {
+        if high.len() != low.len() || low.len() != close.len() {
+            return Err(NapiError::from_reason(
+                "high, low, close must be equal length".to_string(),
+            ));
+        }
+        let mut out = Vec::with_capacity(high.len());
+        for i in 0..high.len() {
+            out.push(
+                self.inner
+                    .update(cnd(high[i], low[i], close[i], 0.0)?)
+                    .unwrap_or(f64::NAN),
+            );
+        }
+        Ok(out)
+    }
+    #[napi]
+    pub fn reset(&mut self) {
+        self.inner.reset();
+    }
+    #[napi(js_name = "isReady")]
+    pub fn is_ready(&self) -> bool {
+        self.inner.is_ready()
+    }
+    #[napi(js_name = "warmupPeriod")]
+    pub fn warmup_period(&self) -> u32 {
+        self.inner.warmup_period() as u32
+    }
+}
+
 #[napi(js_name = "VWMA")]
 pub struct VwmaNode {
     inner: wc::Vwma,