feat(family-15): add 17 risk/performance metrics (#54)

* feat(family-15): add 17 risk/performance metrics

Implements Family 15 pragmatically as standard `Indicator`s instead of a
separate `wickra-metrics` crate. Input is scalar `f64` per bar — period
return, equity sample, or per-trade P&L depending on the metric.

Scalar `Indicator<f64>` (14):
- SharpeRatio(period, risk_free)
- SortinoRatio(period, mar)
- CalmarRatio(period)
- OmegaRatio(period, threshold)
- MaxDrawdown(period)          — rolling, peak-to-trough
- AverageDrawdown(period)
- DrawdownDuration             — cumulative, bars under water (u32 output)
- PainIndex(period)
- ValueAtRisk(period, confidence)
- ConditionalValueAtRisk(period, confidence)
- ProfitFactor(period)
- GainLossRatio(period)
- RecoveryFactor               — cumulative, net return / max drawdown
- KellyCriterion(period)

Two-series `Indicator<(f64, f64)>` for (asset, benchmark) returns (3):
- TreynorRatio(period, risk_free)
- InformationRatio(period)
- Alpha(period, risk_free)     — Jensen / CAPM

Touchpoints:
- 17 new files under `crates/wickra-core/src/indicators/`.
- `mod.rs` + `lib.rs` re-exports.
- Python bindings (`bindings/python/src/lib.rs`, `__init__.py`).
- Node bindings (`bindings/node/src/lib.rs`, `index.js`).
- WASM bindings (`bindings/wasm/src/lib.rs`).
- Fuzz: scalar metrics appended to `indicator_update.rs`; new
  `indicator_update_pair.rs` fuzz target for `(f64, f64)` indicators.
- Python tests: SCALAR + new PAIR parameter lists in `test_new_indicators.py`,
  reference-value cases in `test_known_values.py`.
- Node tests: scalar factories + new pair-factory block in
  `bindings/node/__tests__/indicators.test.js`.
- Benches: 5 Family-15 benches added in `crates/wickra/benches/indicators.rs`.
- Docs: README family-table row + counter (71 -> 88), CHANGELOG entry under
  [Unreleased].

Note: Family 12 (statistik-regression, PR #51) introduces
`node_pair_indicator!` and `wasm_pair_indicator!` macros for Pearson /
Beta / Spearman. Family 15 needs the same pair-input pattern but Family 12
is not yet in main, so the three pair wrappers below are written by hand
in this PR. When PR #51 lands, the trivial merge-conflict is resolved by
keeping the macros from Family 12 and re-using them for Treynor / IR /
Alpha (drop the three handwritten wrappers).

cargo check --workspace --all-features: green.

* fix(family-15): satisfy clippy doc_markdown / if_not_else / digit_grouping

* fix(family-15): unused TreynorRatio import, duplicate pairFactories, _eq_nan inf handling

* fix(family-15): node eq() handles matching infinities for ratio indicators

* test(family-15): cover cold paths flagged by codecov patch

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

@@ -13,6 +13,7 @@ mod adx;
 mod adxr;
 mod alligator;
 mod alma;
+mod alpha;
 mod anchored_vwap;
 mod apo;
 mod aroon;
@@ -21,12 +22,14 @@ mod atr;
 mod atr_bands;
 mod atr_trailing_stop;
 mod autocorrelation;
+mod average_drawdown;
 mod awesome_oscillator;
 mod awesome_oscillator_histogram;
 mod balance_of_power;
 mod beta;
 mod bollinger;
 mod bollinger_bandwidth;
+mod calmar_ratio;
 mod camarilla_pivots;
 mod cci;
 mod center_of_gravity;
@@ -40,6 +43,7 @@ mod classic_pivots;
 mod cmf;
 mod cmo;
 mod coefficient_of_variation;
+mod conditional_value_at_risk;
 mod connors_rsi;
 mod coppock;
 mod cybernetic_cycle;
@@ -54,6 +58,7 @@ mod donchian;
 mod donchian_stop;
 mod double_bollinger;
 mod dpo;
+mod drawdown_duration;
 mod ease_of_movement;
 mod ehlers_stochastic;
 mod elder_impulse;
@@ -67,6 +72,7 @@ mod fisher_transform;
 mod force_index;
 mod fractal_chaos_bands;
 mod frama;
+mod gain_loss_ratio;
 mod garman_klass;
 mod hammer;
 mod hanging_man;
@@ -80,12 +86,14 @@ mod hurst_channel;
 mod hurst_exponent;
 mod ichimoku;
 mod inertia;
+mod information_ratio;
 mod initial_balance;
 mod instantaneous_trendline;
 mod inverse_fisher_transform;
 mod inverted_hammer;
 mod jma;
 mod kama;
+mod kelly_criterion;
 mod keltner;
 mod kst;
 mod kurtosis;
@@ -101,6 +109,7 @@ mod mama;
 mod market_facilitation_index;
 mod marubozu;
 mod mass_index;
+mod max_drawdown;
 mod mcginley_dynamic;
 mod median_absolute_deviation;
 mod median_price;
@@ -110,7 +119,9 @@ mod morning_evening_star;
 mod natr;
 mod nvi;
 mod obv;
+mod omega_ratio;
 mod opening_range;
+mod pain_index;
 mod parkinson;
 mod pearson_correlation;
 mod percent_b;
@@ -119,9 +130,11 @@ mod pgo;
 mod piercing_dark_cloud;
 mod pmo;
 mod ppo;
+mod profit_factor;
 mod psar;
 mod pvi;
 mod r_squared;
+mod recovery_factor;
 mod renko_trailing_stop;
 mod roc;
 mod rogers_satchell;
@@ -130,12 +143,14 @@ mod rsi;
 mod rvi;
 mod rvi_volatility;
 mod rwi;
+mod sharpe_ratio;
 mod shooting_star;
 mod sine_wave;
 mod skewness;
 mod sma;
 mod smi;
 mod smma;
+mod sortino_ratio;
 mod spearman_correlation;
 mod spinning_top;
 mod standard_error;
@@ -166,6 +181,7 @@ mod three_inside;
 mod three_outside;
 mod three_soldiers_or_crows;
 mod tii;
+mod treynor_ratio;
 mod trima;
 mod trix;
 mod true_range;
@@ -177,6 +193,7 @@ mod typical_price;
 mod ulcer_index;
 mod ultimate_oscillator;
 mod value_area;
+mod value_at_risk;
 mod variance;
 mod vertical_horizontal_filter;
 mod vidya;
@@ -210,6 +227,7 @@ pub use adx::{Adx, AdxOutput};
 pub use adxr::Adxr;
 pub use alligator::{Alligator, AlligatorOutput};
 pub use alma::Alma;
+pub use alpha::Alpha;
 pub use anchored_vwap::AnchoredVwap;
 pub use apo::Apo;
 pub use aroon::{Aroon, AroonOutput};
@@ -218,12 +236,14 @@ pub use atr::Atr;
 pub use atr_bands::{AtrBands, AtrBandsOutput};
 pub use atr_trailing_stop::AtrTrailingStop;
 pub use autocorrelation::Autocorrelation;
+pub use average_drawdown::AverageDrawdown;
 pub use awesome_oscillator::AwesomeOscillator;
 pub use awesome_oscillator_histogram::AwesomeOscillatorHistogram;
 pub use balance_of_power::BalanceOfPower;
 pub use beta::Beta;
 pub use bollinger::{BollingerBands, BollingerOutput};
 pub use bollinger_bandwidth::BollingerBandwidth;
+pub use calmar_ratio::CalmarRatio;
 pub use camarilla_pivots::{Camarilla, CamarillaPivotsOutput};
 pub use cci::Cci;
 pub use center_of_gravity::CenterOfGravity;
@@ -237,6 +257,7 @@ pub use classic_pivots::{ClassicPivots, ClassicPivotsOutput};
 pub use cmf::ChaikinMoneyFlow;
 pub use cmo::Cmo;
 pub use coefficient_of_variation::CoefficientOfVariation;
+pub use conditional_value_at_risk::ConditionalValueAtRisk;
 pub use connors_rsi::ConnorsRsi;
 pub use coppock::Coppock;
 pub use cybernetic_cycle::CyberneticCycle;
@@ -251,6 +272,7 @@ pub use donchian::{Donchian, DonchianOutput};
 pub use donchian_stop::{DonchianStop, DonchianStopOutput};
 pub use double_bollinger::{DoubleBollinger, DoubleBollingerOutput};
 pub use dpo::Dpo;
+pub use drawdown_duration::DrawdownDuration;
 pub use ease_of_movement::EaseOfMovement;
 pub use ehlers_stochastic::EhlersStochastic;
 pub use elder_impulse::ElderImpulse;
@@ -264,6 +286,7 @@ pub use fisher_transform::FisherTransform;
 pub use force_index::ForceIndex;
 pub use fractal_chaos_bands::{FractalChaosBands, FractalChaosBandsOutput};
 pub use frama::Frama;
+pub use gain_loss_ratio::GainLossRatio;
 pub use garman_klass::GarmanKlassVolatility;
 pub use hammer::Hammer;
 pub use hanging_man::HangingMan;
@@ -277,12 +300,14 @@ pub use hurst_channel::{HurstChannel, HurstChannelOutput};
 pub use hurst_exponent::HurstExponent;
 pub use ichimoku::{Ichimoku, IchimokuOutput};
 pub use inertia::Inertia;
+pub use information_ratio::InformationRatio;
 pub use initial_balance::{InitialBalance, InitialBalanceOutput};
 pub use instantaneous_trendline::InstantaneousTrendline;
 pub use inverse_fisher_transform::InverseFisherTransform;
 pub use inverted_hammer::InvertedHammer;
 pub use jma::Jma;
 pub use kama::Kama;
+pub use kelly_criterion::KellyCriterion;
 pub use keltner::{Keltner, KeltnerOutput};
 pub use kst::{Kst, KstOutput};
 pub use kurtosis::Kurtosis;
@@ -298,6 +323,7 @@ pub use mama::{Mama, MamaOutput};
 pub use market_facilitation_index::MarketFacilitationIndex;
 pub use marubozu::Marubozu;
 pub use mass_index::MassIndex;
+pub use max_drawdown::MaxDrawdown;
 pub use mcginley_dynamic::McGinleyDynamic;
 pub use median_absolute_deviation::MedianAbsoluteDeviation;
 pub use median_price::MedianPrice;
@@ -307,7 +333,9 @@ pub use morning_evening_star::MorningEveningStar;
 pub use natr::Natr;
 pub use nvi::Nvi;
 pub use obv::Obv;
+pub use omega_ratio::OmegaRatio;
 pub use opening_range::{OpeningRange, OpeningRangeOutput};
+pub use pain_index::PainIndex;
 pub use parkinson::ParkinsonVolatility;
 pub use pearson_correlation::PearsonCorrelation;
 pub use percent_b::PercentB;
@@ -316,9 +344,11 @@ pub use pgo::Pgo;
 pub use piercing_dark_cloud::PiercingDarkCloud;
 pub use pmo::Pmo;
 pub use ppo::Ppo;
+pub use profit_factor::ProfitFactor;
 pub use psar::Psar;
 pub use pvi::Pvi;
 pub use r_squared::RSquared;
+pub use recovery_factor::RecoveryFactor;
 pub use renko_trailing_stop::RenkoTrailingStop;
 pub use roc::Roc;
 pub use rogers_satchell::RogersSatchellVolatility;
@@ -327,12 +357,14 @@ pub use rsi::Rsi;
 pub use rvi::Rvi;
 pub use rvi_volatility::RviVolatility;
 pub use rwi::{Rwi, RwiOutput};
+pub use sharpe_ratio::SharpeRatio;
 pub use shooting_star::ShootingStar;
 pub use sine_wave::SineWave;
 pub use skewness::Skewness;
 pub use sma::Sma;
 pub use smi::Smi;
 pub use smma::Smma;
+pub use sortino_ratio::SortinoRatio;
 pub use spearman_correlation::SpearmanCorrelation;
 pub use spinning_top::SpinningTop;
 pub use standard_error::StandardError;
@@ -363,6 +395,7 @@ pub use three_inside::ThreeInside;
 pub use three_outside::ThreeOutside;
 pub use three_soldiers_or_crows::ThreeSoldiersOrCrows;
 pub use tii::Tii;
+pub use treynor_ratio::TreynorRatio;
 pub use trima::Trima;
 pub use trix::Trix;
 pub use true_range::TrueRange;
@@ -374,6 +407,7 @@ pub use typical_price::TypicalPrice;
 pub use ulcer_index::UlcerIndex;
 pub use ultimate_oscillator::UltimateOscillator;
 pub use value_area::{ValueArea, ValueAreaOutput};
+pub use value_at_risk::ValueAtRisk;
 pub use variance::Variance;
 pub use vertical_horizontal_filter::VerticalHorizontalFilter;
 pub use vidya::Vidya;