feat(data-layer): Resampler (candle resampling) in all 10 languages (#310)

* feat(data-layer): Resampler (candle resampling) in all 10 languages

Second data-layer feature (F3): resample candles into a higher timeframe.

- Native (Node.js/WASM): new Resampler(timeframe) -> update(o,h,l,c,v,ts):
  Candle|null + flush(): Candle|null. Python the same -> tuple|None.
- C ABI: wickra_resampler_new/update/flush/free (update has the multi-output
  shape so the generators auto-emit it; flush is bespoke). Go Update -> (Candle,
  bool) + Flush; C# Candle? Update/Flush; Java Candle update/flush; R update()
  generic + a flush() S3 method (extends base::flush); C/C++ direct.
- Cross-language golden (testdata/golden/data_resampled.csv): the shared input
  candles resampled into 5-unit buckets, the final partial bucket via flush,
  pinned bit-for-bit across every binding.

Verified locally in all 10 (3 candles for the 5-unit smoke; 16 for the golden).
The WickraCandle output record is shared with the tick aggregator (deduped).

* test(node): exclude data-layer types from the indicator completeness contract

The Resampler exposes update(), so the completeness test flagged it as an
indicator and required batch/reset/isReady/warmupPeriod, which a data-layer type
does not have. Exclude TickAggregator and Resampler like the bar builders.

bindings/node/index.d.ts

@@ -5957,3 +5957,19 @@ export declare class TickAggregator {
   /** Whether gap filling is enabled. */
   fillsGaps(): boolean
 }
+export type ResamplerNode = Resampler
+/** Resample candles into a higher timeframe (e.g. 1m -> 5m). */
+export declare class Resampler {
+  /**
+   * Construct a resampler that aggregates inputs into `timeframe`-sized
+   * candles (same unit as the candle timestamps).
+   */
+  constructor(timeframe: number)
+  /**
+   * Push one candle; returns the completed higher-timeframe candle when a
+   * bucket boundary is crossed, otherwise `null`.
+   */
+  update(open: number, high: number, low: number, close: number, volume: number, timestamp: number): CandleValue | null
+  /** Emit the final, still-open candle (or `null` if none is pending). */
+  flush(): CandleValue | null
+}