feat: add RRSI (Rocket RSI) — Ehlers TASC May 2018

Algorithm: SuperSmoother-filtered momentum → Ehlers RSI → Fisher Transform
- 2-pole Butterworth IIR pre-filter removes noise
- Ehlers RSI (raw summation, not Wilder) outputs [-1,1]
- arctanh produces Gaussian-distributed zero-mean oscillator

Files: Rrsi.cs, Rrsi.Quantower.cs, Rrsi.md, 31+7 tests
Integration: sidebar, indices, Python bridge (Exports, _bridge, oscillators, SPEC)
Build: 0 warnings, 0 errors | Tests: 15,963 passed, 0 failed

python/SPEC.md

@@ -671,6 +671,7 @@ packages = ["quantalib"]
 | reflex | `Reflex` | A | period |
 | reverseema | `ReverseEma` | A | period |
 | rvgi | `Rvgi` | C (OHLC) | period |
+| rrsi | `Rrsi` | A | smoothLength, rsiLength |
 | smi | `Smi` | I (HLC→2+) | period, smoothK, smoothD |
 | squeeze | `Squeeze` | I (HLC→multi) | bbPeriod, kcPeriod... |
 | squeeze_pro | `SqueezePro` | I (HLC→multi) | period, bbMult, kcMultWide/Normal/Narrow |

python/quantalib/_bridge.py

@@ -438,6 +438,7 @@ HAS_DPO = _bind("qtl_dpo", [_dp, _ci, _dp, _ci])
 HAS_TRIX = _bind("qtl_trix", [_dp, _ci, _dp, _ci])
 HAS_INERTIA = _bind("qtl_inertia", [_dp, _ci, _dp, _ci])
 HAS_RSX = _bind("qtl_rsx", [_dp, _ci, _dp, _ci])
+HAS_RRSI = _bind("qtl_rrsi", [_dp, _ci, _dp, _ci, _ci])
 HAS_ER = _bind("qtl_er", [_dp, _ci, _dp, _ci])
 HAS_CTI = _bind("qtl_cti", [_dp, _ci, _dp, _ci])
 HAS_REFLEX = _bind("qtl_reflex", [_dp, _ci, _dp, _ci])

python/quantalib/oscillators.py

@@ -25,6 +25,7 @@ __all__ = [
     "qqe",
     "reverseema",
     "rvgi",
+    "rrsi",
     "smi",
     "squeeze",
     "stc",
@@ -283,6 +284,17 @@ def rvgi(open: object, high: object, low: object, close: object, period: int = 1
     return _wrap_multi({"rvgiOutput": rvgiOutput, "signalOutput": signalOutput}, idx, "oscillators", offset)
 
 
+def rrsi(close: object, smoothLength: int = 10, rsiLength: int = 10, offset: int = 0, **kwargs) -> object:
+    """Rocket RSI (Ehlers) — Fisher Transform of Super Smoother–filtered RSI."""
+    src = _to_np(close)
+    n = len(src)
+    out = _np.empty(n, dtype=_np.float64)
+    _bridge._check(_bridge._lib.qtl_rrsi(
+        src.ctypes.data_as(_bridge._dp), n,
+        out.ctypes.data_as(_bridge._dp), smoothLength, rsiLength))
+    return _shift(out, offset)
+
+
 def smi(high: object, low: object, close: object, kPeriod: int = 14, kSmooth: int = 3, dSmooth: int = 3, blau: int = 3, offset: int = 0, **kwargs) -> object:
     """Stochastic Momentum Index."""
     kPeriod = int(kPeriod)

python/src/Exports.cs

@@ -327,6 +327,17 @@ public static unsafe partial class Exports
         catch { return StatusCodes.QTL_ERR_INTERNAL; }
     }
 
+    // Rrsi: Pattern A (dual period params)
+    [UnmanagedCallersOnly(EntryPoint = "qtl_rrsi")]
+    public static int QtlRrsi(double* src, int n, double* dst, int smoothLength, int rsiLength)
+    {
+        int v = Chk1(src, dst, n); if (v != 0) return v;
+        v = ChkPeriod(smoothLength); if (v != 0) return v;
+        v = ChkPeriod(rsiLength); if (v != 0) return v;
+        try { Rrsi.Batch(Src(src, n), Dst(dst, n), smoothLength, rsiLength); return StatusCodes.QTL_OK; }
+        catch { return StatusCodes.QTL_ERR_INTERNAL; }
+    }
+
     // Er: Pattern A
     [UnmanagedCallersOnly(EntryPoint = "qtl_er")]
     public static int QtlEr(double* src, int n, double* dst, int period)