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/indicators/mod.rs

@@ -24,6 +24,7 @@ mod awesome_oscillator_histogram;
 mod balance_of_power;
 mod bollinger;
 mod bollinger_bandwidth;
+mod camarilla_pivots;
 mod cci;
 mod cfo;
 mod chaikin_oscillator;
@@ -31,12 +32,14 @@ mod chaikin_volatility;
 mod chande_kroll_stop;
 mod chandelier_exit;
 mod choppiness_index;
+mod classic_pivots;
 mod cmf;
 mod cmo;
 mod connors_rsi;
 mod coppock;
 mod dema;
 mod demand_index;
+mod demark_pivots;
 mod donchian;
 mod donchian_stop;
 mod double_bollinger;
@@ -45,6 +48,7 @@ mod ease_of_movement;
 mod elder_impulse;
 mod ema;
 mod evwma;
+mod fibonacci_pivots;
 mod force_index;
 mod fractal_chaos_bands;
 mod frama;
@@ -125,12 +129,15 @@ mod vwma;
 mod vzo;
 mod wave_trend;
 mod weighted_close;
+mod williams_fractals;
 mod williams_r;
 mod wma;
+mod woodie_pivots;
 mod yang_zhang;
 mod yoyo_exit;
 mod z_score;
 mod zero_lag_macd;
+mod zig_zag;
 mod zlema;
 
 pub use acceleration_bands::{AccelerationBands, AccelerationBandsOutput};
@@ -153,6 +160,7 @@ pub use awesome_oscillator_histogram::AwesomeOscillatorHistogram;
 pub use balance_of_power::BalanceOfPower;
 pub use bollinger::{BollingerBands, BollingerOutput};
 pub use bollinger_bandwidth::BollingerBandwidth;
+pub use camarilla_pivots::{Camarilla, CamarillaPivotsOutput};
 pub use cci::Cci;
 pub use cfo::Cfo;
 pub use chaikin_oscillator::ChaikinOscillator;
@@ -160,12 +168,14 @@ pub use chaikin_volatility::ChaikinVolatility;
 pub use chande_kroll_stop::{ChandeKrollStop, ChandeKrollStopOutput};
 pub use chandelier_exit::{ChandelierExit, ChandelierExitOutput};
 pub use choppiness_index::ChoppinessIndex;
+pub use classic_pivots::{ClassicPivots, ClassicPivotsOutput};
 pub use cmf::ChaikinMoneyFlow;
 pub use cmo::Cmo;
 pub use connors_rsi::ConnorsRsi;
 pub use coppock::Coppock;
 pub use dema::Dema;
 pub use demand_index::DemandIndex;
+pub use demark_pivots::{DemarkPivots, DemarkPivotsOutput};
 pub use donchian::{Donchian, DonchianOutput};
 pub use donchian_stop::{DonchianStop, DonchianStopOutput};
 pub use double_bollinger::{DoubleBollinger, DoubleBollingerOutput};
@@ -174,6 +184,7 @@ pub use ease_of_movement::EaseOfMovement;
 pub use elder_impulse::ElderImpulse;
 pub use ema::Ema;
 pub use evwma::Evwma;
+pub use fibonacci_pivots::{FibonacciPivots, FibonacciPivotsOutput};
 pub use force_index::ForceIndex;
 pub use fractal_chaos_bands::{FractalChaosBands, FractalChaosBandsOutput};
 pub use frama::Frama;
@@ -254,10 +265,13 @@ pub use vwma::Vwma;
 pub use vzo::Vzo;
 pub use wave_trend::{WaveTrend, WaveTrendOutput};
 pub use weighted_close::WeightedClose;
+pub use williams_fractals::{WilliamsFractals, WilliamsFractalsOutput};
 pub use williams_r::WilliamsR;
 pub use wma::Wma;
+pub use woodie_pivots::{WoodiePivots, WoodiePivotsOutput};
 pub use yang_zhang::YangZhangVolatility;
 pub use yoyo_exit::YoyoExit;
 pub use z_score::ZScore;
 pub use zero_lag_macd::{ZeroLagMacd, ZeroLagMacdOutput};
+pub use zig_zag::{ZigZag, ZigZagOutput};
 pub use zlema::Zlema;