F13a: add Accelerator Oscillator, Balance of Power, Choppiness Index and Vertical Horizontal Filter

First half of the eight indicators that fill out the new family taxonomy.

- Rust core: accelerator_oscillator.rs (AcceleratorOscillator — AO minus a
  short SMA of itself), balance_of_power.rs (BalanceOfPower — per-bar
  (close-open)/(high-low)), choppiness_index.rs (ChoppinessIndex — summed
  true range over the high-low span, log-scaled) and
  vertical_horizontal_filter.rs (VerticalHorizontalFilter — net move over
  total move). Each with a full Indicator impl, runnable doctest and
  reference / property / warmup / reset / batch==streaming tests.
- Python / Node / WASM: classes wired through all three bindings
  (BalanceOfPower carries an explicit open column; VHF rides the scalar
  macros) plus .pyi stubs and __init__.py / __all__ entries.
- Wiki: four new Indicator-*.md pages.

The eight-family taxonomy restructure (Overview / Home / README / folder
layout) lands in F13c once F13b's four indicators are in.

cargo fmt + clippy (core/wickra/data/wasm/node) clean; 481 core tests,
25 data tests and 70 doctests green.

crates/wickra-core/src/indicators/mod.rs

@@ -4,6 +4,7 @@
 //! volume) but every public name is also re-exported flat from this module and
 //! from the crate root for convenience.
 
+mod accelerator_oscillator;
 mod adl;
 mod adx;
 mod aroon;
@@ -11,12 +12,14 @@ mod aroon_oscillator;
 mod atr;
 mod atr_trailing_stop;
 mod awesome_oscillator;
+mod balance_of_power;
 mod bollinger;
 mod bollinger_bandwidth;
 mod cci;
 mod chaikin_oscillator;
 mod chande_kroll_stop;
 mod chandelier_exit;
+mod choppiness_index;
 mod cmf;
 mod cmo;
 mod coppock;
@@ -59,6 +62,7 @@ mod tsi;
 mod typical_price;
 mod ulcer_index;
 mod ultimate_oscillator;
+mod vertical_horizontal_filter;
 mod vortex;
 mod vpt;
 mod vwap;
@@ -68,6 +72,7 @@ mod williams_r;
 mod wma;
 mod zlema;
 
+pub use accelerator_oscillator::AcceleratorOscillator;
 pub use adl::Adl;
 pub use adx::{Adx, AdxOutput};
 pub use aroon::{Aroon, AroonOutput};
@@ -75,12 +80,14 @@ pub use aroon_oscillator::AroonOscillator;
 pub use atr::Atr;
 pub use atr_trailing_stop::AtrTrailingStop;
 pub use awesome_oscillator::AwesomeOscillator;
+pub use balance_of_power::BalanceOfPower;
 pub use bollinger::{BollingerBands, BollingerOutput};
 pub use bollinger_bandwidth::BollingerBandwidth;
 pub use cci::Cci;
 pub use chaikin_oscillator::ChaikinOscillator;
 pub use chande_kroll_stop::{ChandeKrollStop, ChandeKrollStopOutput};
 pub use chandelier_exit::{ChandelierExit, ChandelierExitOutput};
+pub use choppiness_index::ChoppinessIndex;
 pub use cmf::ChaikinMoneyFlow;
 pub use cmo::Cmo;
 pub use coppock::Coppock;
@@ -123,6 +130,7 @@ pub use tsi::Tsi;
 pub use typical_price::TypicalPrice;
 pub use ulcer_index::UlcerIndex;
 pub use ultimate_oscillator::UltimateOscillator;
+pub use vertical_horizontal_filter::VerticalHorizontalFilter;
 pub use vortex::{Vortex, VortexOutput};
 pub use vpt::VolumePriceTrend;
 pub use vwap::{RollingVwap, Vwap};