Add B7 Trailing Stops family (6 indicators) (#193)

Adds the **Trailing Stops** family deepening (B7), six new indicators (434 -> 440):

- **KaseDevStop** — Cynthia Kase's volatility stop on the standard deviation of the two-bar true range.
- **ElderSafeZone** — Alexander Elder's stop offset by a multiple of average market noise.
- **AtrRatchet** — Kaufman ATR ratchet that tightens its multiple by a per-bar increment.
- **Nrtr** — Nick Rypock Trailing Reverse (percentage band).
- **TimeBasedStop** — exits after a fixed number of bars (scalar fraction of elapsed life).
- **ModifiedMaStop** — moving-average based trailing stop.

("Wilder Volatility System" is intentionally skipped — it overlaps the existing VoltyStop/Psar/SarExt.)

Each takes Candle input; the five band/structure stops emit a {value, direction} struct, TimeBasedStop a scalar. Wired across core, Python/Node/WASM bindings, fuzz target and tests. Verified locally: 3560 core lib + 398 doc tests, clippy clean, 515 node tests, 852 pytest, counter 440.

bindings/node/index.d.ts

@@ -149,6 +149,26 @@ export interface DonchianStopValue {
   stopLong: number
   stopShort: number
 }
+export interface KaseDevStopValue {
+  value: number
+  direction: number
+}
+export interface ElderSafeZoneValue {
+  value: number
+  direction: number
+}
+export interface AtrRatchetValue {
+  value: number
+  direction: number
+}
+export interface NrtrValue {
+  value: number
+  direction: number
+}
+export interface ModifiedMaStopValue {
+  value: number
+  direction: number
+}
 /** Vortex Indicator pair: `VI+` and `VI-`. */
 export interface VortexValue {
   plus: number
@@ -1668,6 +1688,15 @@ export declare class ProjectionOscillator {
   isReady(): boolean
   warmupPeriod(): number
 }
+export type TimeBasedStopNode = TimeBasedStop
+export declare class TimeBasedStop {
+  constructor(maxBars: number)
+  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 StochNode = Stochastic
 export declare class Stochastic {
   constructor(kPeriod: number, dPeriod: number)
@@ -2328,6 +2357,71 @@ export declare class RenkoTrailingStop {
   isReady(): boolean
   warmupPeriod(): number
 }
+export type KaseDevStopNode = KaseDevStop
+export declare class KaseDevStop {
+  constructor(period: number, dev: number)
+  update(high: number, low: number, close: number): KaseDevStopValue | null
+  /**
+   * Returns `[value0, direction0, value1, direction1, ...]`, length `2 * n`.
+   * Warmup positions are `NaN`.
+   */
+  batch(high: Array<number>, low: Array<number>, close: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type ElderSafeZoneNode = ElderSafeZone
+export declare class ElderSafeZone {
+  constructor(period: number, coeff: number)
+  update(high: number, low: number, close: number): ElderSafeZoneValue | null
+  /**
+   * Returns `[value0, direction0, value1, direction1, ...]`, length `2 * n`.
+   * Warmup positions are `NaN`.
+   */
+  batch(high: Array<number>, low: Array<number>, close: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type AtrRatchetNode = AtrRatchet
+export declare class AtrRatchet {
+  constructor(atrPeriod: number, startMult: number, increment: number)
+  update(high: number, low: number, close: number): AtrRatchetValue | null
+  /**
+   * Returns `[value0, direction0, value1, direction1, ...]`, length `2 * n`.
+   * Warmup positions are `NaN`.
+   */
+  batch(high: Array<number>, low: Array<number>, close: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type NrtrNode = Nrtr
+export declare class Nrtr {
+  constructor(pct: number)
+  update(high: number, low: number, close: number): NrtrValue | null
+  /**
+   * Returns `[value0, direction0, value1, direction1, ...]`, length `2 * n`.
+   * Warmup positions are `NaN`.
+   */
+  batch(high: Array<number>, low: Array<number>, close: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
+export type ModifiedMaStopNode = ModifiedMaStop
+export declare class ModifiedMaStop {
+  constructor(period: number)
+  update(high: number, low: number, close: number): ModifiedMaStopValue | null
+  /**
+   * Returns `[value0, direction0, value1, direction1, ...]`, length `2 * n`.
+   * Warmup positions are `NaN`.
+   */
+  batch(high: Array<number>, low: Array<number>, close: Array<number>): Array<number>
+  reset(): void
+  isReady(): boolean
+  warmupPeriod(): number
+}
 export type TypicalPriceNode = TypicalPrice
 export declare class TypicalPrice {
   constructor()