feat(family-09): add 7 trailing stops (HiLo, Volty, Yo-Yo, Donchian, Pct, Step, Renko) (#46)

* feat(family-09): add 7 trailing stops (HiLo, Volty, Yo-Yo, Donchian, Pct, Step, Renko)

Rounds out the Trailing Stops family from 5 to 12 indicators:

- HiLoActivator (Crabel): SMA-of-high/SMA-of-low trail with a one-bar
  lag; emits the opposite-side SMA as the trailing stop.
- VoltyStop (Cynthia Kase): ATR trail anchored on the extreme close
  since the trade was opened — tighter than AtrTrailingStop on
  pullbacks.
- YoyoExit: long-only ATR trail with an explicit re-entry trigger at
  trail + multiplier*ATR; exposes an in_trade flag.
- DonchianStop (Turtle): lowest low / highest high over the window;
  multi-output {stop_long, stop_short}.
- PercentageTrailingStop: fixed-percent trail that scales across
  instruments without per-asset tuning.
- StepTrailingStop: snaps to a step_size-aligned grid; mirrors
  discretionary stop-by-hand workflow.
- RenkoTrailingStop: block-anchored trail; only moves on full-block
  advances, ignores intra-block noise.

All seven are wired into wickra-core, the Python / Node / WASM
bindings, the indicator_update + indicator_update_candle fuzz targets,
the wickra bench harness, and the Python + Node test suites. README
counter bumps from 71 to 78; CHANGELOG entry under [Unreleased].

* fix(family-09): satisfy pedantic clippy lints

- hilo_activator: rewrite match-Some/None as if-let-else (single_match_else),
  add backticks around the HiLo identifier in module/struct doc (doc_markdown).
- percentage / step / renko trailing stop tests: use f64::from(i32) instead
  of `as f64` (cast_lossless).
- bench `benches()` is now >100 lines after Family 09 was wired in; allow
  too_many_lines (matches the python pymodule fn).

crates/wickra/benches/indicators.rs

@@ -20,12 +20,13 @@ use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion, Through
 use std::hint::black_box;
 use wickra::{
     AccelerationBands, AdOscillator, Adxr, Alma, AnchoredVwap, Atr, AtrBands, BatchExt,
-    BollingerBands, Candle, DemandIndex, DoubleBollinger, Ema, FractalChaosBands, Frama,
-    GarmanKlassVolatility, HurstChannel, Indicator, Jma, Kst, Kvo, LinRegChannel, MaEnvelope,
-    MacdIndicator, MarketFacilitationIndex, McGinleyDynamic, Nvi, Obv, ParkinsonVolatility, Pgo,
-    Pvi, RogersSatchellVolatility, Rsi, Rvi, RviVolatility, Rwi, Sma, StandardErrorBands,
-    StarcBands, Stochastic, Tii, Tsv, TtmSqueeze, Vidya, VolumeOscillator, VwapStdDevBands, Vzo,
-    WaveTrend, Wma, YangZhangVolatility,
+    BollingerBands, Candle, DemandIndex, DonchianStop, DoubleBollinger, Ema, FractalChaosBands,
+    Frama, GarmanKlassVolatility, HiLoActivator, HurstChannel, Indicator, Jma, Kst, Kvo,
+    LinRegChannel, MaEnvelope, MacdIndicator, MarketFacilitationIndex, McGinleyDynamic, Nvi, Obv,
+    ParkinsonVolatility, PercentageTrailingStop, Pgo, Pvi, RenkoTrailingStop,
+    RogersSatchellVolatility, Rsi, Rvi, RviVolatility, Rwi, Sma, StandardErrorBands, StarcBands,
+    StepTrailingStop, Stochastic, Tii, Tsv, TtmSqueeze, Vidya, VoltyStop, VolumeOscillator,
+    VwapStdDevBands, Vzo, WaveTrend, Wma, YangZhangVolatility, YoyoExit,
 };
 use wickra_data::csv::CandleReader;
 
@@ -154,6 +155,7 @@ where
     group.finish();
 }
 
+#[allow(clippy::too_many_lines)]
 fn benches(c: &mut Criterion) {
     let candles = load_candles();
     let closes: Vec<f64> = candles.iter().map(|c| c.close).collect();
@@ -180,6 +182,21 @@ fn benches(c: &mut Criterion) {
     bench_candle_input(c, "stochastic", &candles, Stochastic::classic);
     bench_candle_input(c, "obv", &candles, Obv::new);
 
+    // --- Family 09: Trailing Stops ---
+    bench_candle_input(c, "hilo_activator", &candles, HiLoActivator::classic);
+    bench_candle_input(c, "volty_stop", &candles, VoltyStop::classic);
+    bench_candle_input(c, "yoyo_exit", &candles, YoyoExit::classic);
+    bench_candle_input(c, "donchian_stop", &candles, DonchianStop::classic);
+    bench_scalar(c, "percentage_trailing_stop", &closes, || {
+        PercentageTrailingStop::new(5.0).unwrap()
+    });
+    bench_scalar(c, "step_trailing_stop", &closes, || {
+        StepTrailingStop::new(1.0).unwrap()
+    });
+    bench_scalar(c, "renko_trailing_stop", &closes, || {
+        RenkoTrailingStop::new(1.0).unwrap()
+    });
+
     // --- Family 07: Volume ---
     bench_candle_input(c, "kvo", &candles, Kvo::classic);
     bench_candle_input(c, "volume_oscillator", &candles, || {