feat(family-08): Pivots & Support/Resistance (7 indicators) (#47)

* feat(family-08): add Classic, Fibonacci, Camarilla, Woodie and DeMark pivots + Williams Fractals + ZigZag

Seven new indicators land the previously empty Pivots & S/R family
(family 08), each implemented in wickra-core with the full Indicator
trait surface (update / reset / warmup_period / is_ready / name),
exposed across Python (PyO3), Node (napi-rs) and WASM (wasm-bindgen)
with the standard streaming + batch APIs, and covered by Rust unit
tests, Python streaming-vs-batch + reference-value tests, Node
streaming-vs-batch tests, the candle-input fuzz target and Rust
microbenchmarks.

- ClassicPivots (7 levels): PP = (H+L+C)/3, three R/S tiers per the
  floor-trader formulas.
- FibonacciPivots (7 levels): PP plus R/S spaced by 0.382 / 0.618 /
  1.000 of the prior range.
- Camarilla (9 levels): Nick Stott's four-tier `C +/- (H - L) * 1.1 /
  {12, 6, 4, 2}` levels.
- WoodiePivots (5 levels): close-weighted PP = (H + L + 2*C) / 4 plus
  two R/S tiers.
- DemarkPivots (3 levels): conditional X sum based on the previous
  bar's open-vs-close relationship.
- WilliamsFractals: five-bar swing detector emitting optional up/down
  fractal prices at the centre of each window.
- ZigZag: percent-threshold swing tracker, non-repainting; emits the
  just-completed extreme and direction on confirmed reversals only.

README family table updated to nine families / 78 indicators;
CHANGELOG records the family-08 addition under [Unreleased].

* fix(family-08 tests): unify MULTI dict to 3-tuple (factory, batch_call, k)

The HEAD-side family-08 test parametrised MULTI[name] as
`(factory, batch_call, output_arity)` so that pivots with arity 3/5/7/9
fit the same harness. Main's entries arrived as 2-tuples; convert them
all to the 3-tuple shape so `make, batch_call, k = MULTI[name]` unpacks
cleanly. Lifecycle test now indexes the tuple instead of destructuring.

* test(zig_zag): tighten flat-oscillation test (drop dead counter branch)

The previous version of `small_oscillations_yield_no_swings` counted
emitted swings, but the assertion proves the counter never increments
so codecov flagged `emitted += 1` as uncovered. Switch to a per-bar
`assert!(...is_none())` — same coverage of the no-swing path, no dead
branch.

crates/wickra-core/src/lib.rs

@@ -48,25 +48,28 @@ pub use indicators::{
     AdxOutput, Adxr, Alligator, AlligatorOutput, Alma, AnchoredVwap, Apo, Aroon, AroonOscillator,
     AroonOutput, Atr, AtrBands, AtrBandsOutput, AtrTrailingStop, AwesomeOscillator,
     AwesomeOscillatorHistogram, BalanceOfPower, BollingerBands, BollingerBandwidth,
-    BollingerOutput, Cci, Cfo, ChaikinMoneyFlow, ChaikinOscillator, ChaikinVolatility,
-    ChandeKrollStop, ChandeKrollStopOutput, ChandelierExit, ChandelierExitOutput, ChoppinessIndex,
-    Cmo, ConnorsRsi, Coppock, Dema, DemandIndex, Donchian, DonchianOutput, DonchianStop,
-    DonchianStopOutput, DoubleBollinger, DoubleBollingerOutput, Dpo, EaseOfMovement, ElderImpulse,
-    Ema, Evwma, ForceIndex, FractalChaosBands, FractalChaosBandsOutput, Frama,
-    GarmanKlassVolatility, HiLoActivator, HistoricalVolatility, Hma, HurstChannel,
-    HurstChannelOutput, Inertia, Jma, Kama, Keltner, KeltnerOutput, Kst, KstOutput, Kvo,
-    LaguerreRsi, LinRegAngle, LinRegChannel, LinRegChannelOutput, LinRegSlope, LinearRegression,
-    MaEnvelope, MaEnvelopeOutput, MacdIndicator, MacdOutput, MarketFacilitationIndex, MassIndex,
-    McGinleyDynamic, MedianPrice, Mfi, Mom, Natr, Nvi, Obv, ParkinsonVolatility, PercentB,
-    PercentageTrailingStop, Pgo, Pmo, Ppo, Psar, Pvi, RenkoTrailingStop, Roc,
-    RogersSatchellVolatility, RollingVwap, Rsi, Rvi, RviVolatility, Rwi, RwiOutput, Sma, Smi, Smma,
-    StandardErrorBands, StandardErrorBandsOutput, StarcBands, StarcBandsOutput, Stc, StdDev,
-    StepTrailingStop, StochRsi, Stochastic, StochasticOutput, SuperTrend, SuperTrendOutput, Tema,
-    Tii, Trima, Trix, TrueRange, Tsi, Tsv, TtmSqueeze, TtmSqueezeOutput, TypicalPrice, UlcerIndex,
-    UltimateOscillator, VerticalHorizontalFilter, Vidya, VoltyStop, VolumeOscillator,
-    VolumePriceTrend, Vortex, VortexOutput, Vwap, VwapStdDevBands, VwapStdDevBandsOutput, Vwma,
-    Vzo, WaveTrend, WaveTrendOutput, WeightedClose, WilliamsR, Wma, YangZhangVolatility, YoyoExit,
-    ZScore, ZeroLagMacd, ZeroLagMacdOutput, Zlema, T3,
+    BollingerOutput, Camarilla, CamarillaPivotsOutput, Cci, Cfo, ChaikinMoneyFlow,
+    ChaikinOscillator, ChaikinVolatility, ChandeKrollStop, ChandeKrollStopOutput, ChandelierExit,
+    ChandelierExitOutput, ChoppinessIndex, ClassicPivots, ClassicPivotsOutput, Cmo, ConnorsRsi,
+    Coppock, Dema, DemandIndex, DemarkPivots, DemarkPivotsOutput, Donchian, DonchianOutput,
+    DonchianStop, DonchianStopOutput, DoubleBollinger, DoubleBollingerOutput, Dpo, EaseOfMovement,
+    ElderImpulse, Ema, Evwma, FibonacciPivots, FibonacciPivotsOutput, ForceIndex,
+    FractalChaosBands, FractalChaosBandsOutput, Frama, GarmanKlassVolatility, HiLoActivator,
+    HistoricalVolatility, Hma, HurstChannel, HurstChannelOutput, Inertia, Jma, Kama, Keltner,
+    KeltnerOutput, Kst, KstOutput, Kvo, LaguerreRsi, LinRegAngle, LinRegChannel,
+    LinRegChannelOutput, LinRegSlope, LinearRegression, MaEnvelope, MaEnvelopeOutput,
+    MacdIndicator, MacdOutput, MarketFacilitationIndex, MassIndex, McGinleyDynamic, MedianPrice,
+    Mfi, Mom, Natr, Nvi, Obv, ParkinsonVolatility, PercentB, PercentageTrailingStop, Pgo, Pmo, Ppo,
+    Psar, Pvi, RenkoTrailingStop, Roc, RogersSatchellVolatility, RollingVwap, Rsi, Rvi,
+    RviVolatility, Rwi, RwiOutput, Sma, Smi, Smma, StandardErrorBands, StandardErrorBandsOutput,
+    StarcBands, StarcBandsOutput, Stc, StdDev, StepTrailingStop, StochRsi, Stochastic,
+    StochasticOutput, SuperTrend, SuperTrendOutput, Tema, Tii, Trima, Trix, TrueRange, Tsi, Tsv,
+    TtmSqueeze, TtmSqueezeOutput, TypicalPrice, UlcerIndex, UltimateOscillator,
+    VerticalHorizontalFilter, Vidya, VoltyStop, VolumeOscillator, VolumePriceTrend, Vortex,
+    VortexOutput, Vwap, VwapStdDevBands, VwapStdDevBandsOutput, Vwma, Vzo, WaveTrend,
+    WaveTrendOutput, WeightedClose, WilliamsFractals, WilliamsFractalsOutput, WilliamsR, Wma,
+    WoodiePivots, WoodiePivotsOutput, YangZhangVolatility, YoyoExit, ZScore, ZeroLagMacd,
+    ZeroLagMacdOutput, ZigZag, ZigZagOutput, Zlema, T3,
 };
 pub use ohlcv::{Candle, Tick};
 pub use traits::{BatchExt, Chain, Indicator};