Add B8 Volume family deepening (7 indicators) (#195)

Deepens the **Volume** family (B8) with seven indicators (440 -> 447):

- **VolumeRsi** — Wilder RSI computed on signed volume flow.
- **WilliamsAd** — Williams Accumulation/Distribution cumulative line (distinct from Chaikin A/D).
- **TwiggsMoneyFlow** — true-range volume accumulation with Wilder smoothing (distinct from CMF).
- **TradeVolumeIndex** — tick-direction volume accumulation past a min-tick threshold (distinct from TSV).
- **IntradayIntensity** — volume weighted by close position within the bar range.
- **BetterVolume** — VSA volume-vs-spread effort/result classifier.
- **VolumeWeightedMacd** — MACD computed on VWMA with signal line and histogram (struct output).

("Up/Down Volume Ratio" already ships from A2.) All Candle input; the six scalar stops emit f64, VolumeWeightedMacd a {macd, signal, histogram} struct. Hand-written Python/Node/WASM bindings for the volume signature. Verified locally: 3620 core lib + 405 doc tests, clippy clean, 522 node tests, 865 pytest, counter 447.

bindings/node/index.d.ts

@@ -489,6 +489,11 @@ export interface FibTimeZonesValue {
   onZone: number
   barsToNext: number
 }
+export interface VolumeWeightedMacdValue {
+  macd: number
+  signal: number
+  histogram: number
+}
 export type SmaNode = SMA
 export declare class SMA {
   constructor(period: number)
@@ -4640,3 +4645,70 @@ export declare class FibTimeZones {
   isReady(): boolean
   warmupPeriod(): number
 }
+export type VolumeRsiNode = VolumeRsi
+export declare class VolumeRsi {
+  constructor(period: number)
+  update(close: number, volume: number): number | null
+  batch(close: Array<number>, volume: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type WadNode = Wad
+export declare class Wad {
+  constructor()
+  update(high: number, low: number, close: number): number | null
+  batch(high: Array<number>, low: Array<number>, close: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type TwiggsMoneyFlowNode = TwiggsMoneyFlow
+export declare class TwiggsMoneyFlow {
+  constructor(period: number)
+  update(high: number, low: number, close: number, volume: number): number | null
+  batch(high: Array<number>, low: Array<number>, close: Array<number>, volume: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type TradeVolumeIndexNode = TradeVolumeIndex
+export declare class TradeVolumeIndex {
+  constructor(minTick: number)
+  update(close: number, volume: number): number | null
+  batch(close: Array<number>, volume: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type IntradayIntensityNode = IntradayIntensity
+export declare class IntradayIntensity {
+  constructor()
+  update(high: number, low: number, close: number, volume: number): number | null
+  batch(high: Array<number>, low: Array<number>, close: Array<number>, volume: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type BetterVolumeNode = BetterVolume
+export declare class BetterVolume {
+  constructor(period: number)
+  update(high: number, low: number, close: number, volume: number): number | null
+  batch(high: Array<number>, low: Array<number>, close: Array<number>, volume: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type VolumeWeightedMacdNode = VolumeWeightedMacd
+export declare class VolumeWeightedMacd {
+  constructor(fast: number, slow: number, signal: number)
+  update(close: number, volume: number): VolumeWeightedMacdValue | null
+  /**
+   * Returns `[macd0, signal0, histogram0, macd1, ...]`, length `3 * n`.
+   * Warmup positions are `NaN`.
+   */
+  batch(close: Array<number>, volume: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}