feat: add Alt-Chart Bars (Renko, Kagi, Point & Figure) via a BarBuilder trait (#146)

Introduces a BarBuilder trait for price-driven chart constructors that emit a variable number of bars per candle (deliberately not Indicator). Adds Renko (box-size bricks, 2-box reversal), Kagi (reversal-amount segments) and Point & Figure (box-size X/O columns, N-box reversal) in a new Alt-Chart Bars family, with custom Python/Node/WASM bindings, a dedicated fuzz target, tests and docs. Indicator count 292 -> 295.

bindings/node/__tests__/completeness.test.js

@@ -8,16 +8,25 @@ const test = require('node:test');
 const assert = require('node:assert/strict');
 const wickra = require('..');
 
+// Bar builders (Renko / Kagi / Point & Figure) implement the `BarBuilder`
+// contract, not `Indicator`: they emit a variable number of completed bars per
+// candle and have no fixed warmup or ready state. They expose update/batch/reset
+// but intentionally not isReady/warmupPeriod, so they are excluded from the
+// Indicator completeness contract below (their interface is covered by the
+// dedicated bar-builder tests).
+const BAR_BUILDERS = new Set(['RenkoBars', 'KagiBars', 'PointAndFigureBars']);
+
 // An "indicator class" is an exported constructor whose prototype carries the
-// streaming `update` method. This excludes `version` (a plain function) and any
-// non-indicator export.
+// streaming `update` method. This excludes `version` (a plain function), the bar
+// builders, and any non-indicator export.
 function indicatorClasses() {
   return Object.keys(wickra).filter((name) => {
     const value = wickra[name];
     return (
       typeof value === 'function' &&
       value.prototype &&
-      typeof value.prototype.update === 'function'
+      typeof value.prototype.update === 'function' &&
+      !BAR_BUILDERS.has(name)
     );
   });
 }