F6: add Aroon Oscillator, Vortex and Mass Index
Completes the F6 family (Trend strength) end to end:
- Rust core: aroon_oscillator.rs (AroonUp - AroonDown, one-line trend
gauge), vortex.rs (Vortex Indicator VI+/VI- with the VortexOutput
struct), mass_index.rs (Dorsey's range-expansion sum of the
EMA-of-range ratio). Each with a full Indicator impl, runnable doctest
and reference / saturation / warmup / reset / batch==streaming tests.
- Python: PyAroonOscillator / PyVortex / PyMassIndex PyO3 classes +
module registration + .pyi stubs (defaults Aroon=14, Vortex=14,
MassIndex=(9,25)).
- Node: explicit AroonOscillatorNode, VortexNode (with VortexValue
object) and MassIndexNode; index.d.ts and index.js updated.
- WASM: WasmAroonOscillator, WasmVortex, WasmMassIndex.
- Wiki: Indicator-AroonOscillator/Vortex/MassIndex.md plus rows in
Indicators-Overview.md and entries in Home.md.
cargo fmt + clippy (core/wickra/data/wasm/node) clean; 320 core tests,
25 data tests and 45 doctests green.
kingchenc
16c0639f0c