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.

crates/wickra-core/src/lib.rs

@@ -47,7 +47,8 @@ pub use indicators::{
     Adx, AdxOutput, Aroon, AroonOutput, Atr, AwesomeOscillator, BollingerBands, BollingerOutput,
     Cci, Cmo, Dema, Donchian, DonchianOutput, Ema, Hma, Kama, Keltner, KeltnerOutput,
     MacdIndicator, MacdOutput, Mfi, Mom, Obv, Pmo, Psar, Roc, RollingVwap, Rsi, Sma, Smma,
-    Stochastic, StochasticOutput, Tema, Trima, Trix, Tsi, Vwap, Vwma, WilliamsR, Wma, Zlema, T3,
+    StochRsi, Stochastic, StochasticOutput, Tema, Trima, Trix, Tsi, UltimateOscillator, Vwap, Vwma,
+    WilliamsR, Wma, Zlema, T3,
 };
 pub use ohlcv::{Candle, Tick};
 pub use traits::{BatchExt, Chain, Indicator};