feat: add 7 alt-chart bar builders (B19) (#220)

Adds seven information-driven bar builders to the **Alt-Chart Bars** family, the final batch of the family-deepening run. Indicator count **507 → 514**.

## Builders
All implement the `BarBuilder` trait (`update(Candle) -> Vec<Bar>`), emitting a data-dependent number of completed bars per candle.

| Builder | Driver | Bar fields |
|---------|--------|-----------|
| `RangeBars` | close | open, close, direction |
| `TickBars` | OHLCV | open, high, low, close, volume |
| `VolumeBars` | OHLCV | open, high, low, close, volume |
| `DollarBars` (Lopez de Prado) | OHLCV | + dollar |
| `ImbalanceBars` | OHLC | + imbalance, direction |
| `RunBars` | OHLC | + length, direction |
| `ThreeLineBreakBars` | close | open, close, direction |

## Touchpoints
Seven core modules (each with full unit tests), `mod.rs`/`lib.rs` (builders counted, bar element types on their own re-export lines), README family rows, Python/Node/WASM hand-written bindings for the variable-length output (Python tuples + `(k, N)` ndarray; Node `Vec<object>`; WASM array of objects), the `bar_builder_update_candle` fuzz target, dedicated Python + Node tests, the `BAR_BUILDERS` completeness exclusion, and CHANGELOG.

## Verification
- `cargo test -p wickra-core --lib` — 4207 passed
- `cargo test -p wickra-core --doc` — 464 passed
- `cargo clippy --workspace --all-targets --all-features -- -D warnings` — clean
- `npm test` (node) — 584 passed
- `pytest` (python) — 957 passed

fuzz/fuzz_targets/bar_builder_update_candle.rs

@@ -11,7 +11,7 @@
 //! and zero ranges within that band.
 
 use libfuzzer_sys::fuzz_target;
-use wickra_core::{BarBuilder, Candle, KagiBars, PointAndFigureBars, RenkoBars};
+use wickra_core::{BarBuilder, Candle, DollarBars, ImbalanceBars, KagiBars, PointAndFigureBars, RangeBars, RenkoBars, RunBars, ThreeLineBreakBars, TickBars, VolumeBars};
 
 /// Reinterpret the fuzz bytes as `[open, high, low, close, volume]` groups,
 /// keeping only structurally-valid candles whose magnitudes stay in a band that
@@ -40,6 +40,13 @@ fuzz_target!(|data: Vec<f64>| {
     drive(RenkoBars::new(5.0).unwrap(), &candles);
     drive(KagiBars::new(5.0).unwrap(), &candles);
     drive(PointAndFigureBars::new(5.0, 3).unwrap(), &candles);
+    drive(RangeBars::new(2.0).unwrap(), &candles);
+    drive(TickBars::new(5).unwrap(), &candles);
+    drive(VolumeBars::new(100.0).unwrap(), &candles);
+    drive(DollarBars::new(10000.0).unwrap(), &candles);
+    drive(ImbalanceBars::new(5.0).unwrap(), &candles);
+    drive(RunBars::new(3).unwrap(), &candles);
+    drive(ThreeLineBreakBars::new(3).unwrap(), &candles);
 
     let _ = RenkoBars::new(5.0).unwrap().batch(&candles);
     let _ = KagiBars::new(5.0).unwrap().batch(&candles);