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/indicators/mod.rs

@@ -27,12 +27,14 @@ mod roc;
 mod rsi;
 mod sma;
 mod smma;
+mod stoch_rsi;
 mod stochastic;
 mod t3;
 mod tema;
 mod trima;
 mod trix;
 mod tsi;
+mod ultimate_oscillator;
 mod vwap;
 mod vwma;
 mod williams_r;
@@ -62,12 +64,14 @@ pub use roc::Roc;
 pub use rsi::Rsi;
 pub use sma::Sma;
 pub use smma::Smma;
+pub use stoch_rsi::StochRsi;
 pub use stochastic::{Stochastic, StochasticOutput};
 pub use t3::T3;
 pub use tema::Tema;
 pub use trima::Trima;
 pub use trix::Trix;
 pub use tsi::Tsi;
+pub use ultimate_oscillator::UltimateOscillator;
 pub use vwap::{RollingVwap, Vwap};
 pub use vwma::Vwma;
 pub use williams_r::WilliamsR;