Update main.py

main.py

@@ -80,8 +80,8 @@ def spectral_features(emb: np.ndarray) -> Dict[str, float]:
     phi = float(np.clip(total / (total + 1.0), 0.0, 1.0))
     omega = float(np.clip(dominant_idx / len(power), 0.0, 1.0))
 
-    S_RRF = float(np.mean(np.diff(power)))
-    C_RRF = float(power[dominant_idx] / total)
+    S_RRF = float(1.0 - np.std(power) / (np.mean(power) + 1e-12))
+    S_RRF = float(np.clip(S_RRF, 0.0, 1.0))
 
     coherence = float(0.5 * (1.0 - np.std(power) / (np.mean(power) + 1e-12)) + 0.5 * C_RRF)
 
@@ -179,6 +179,15 @@ class RerankResponse(BaseModel):
 # ============================
 # MANIFEST / HEALTH
 # ============================
+@app.get("/")
+def root():
+    return {
+        "status": "ok",
+        "model": "RRFSavantMetaLogicV2",
+        "version": "Φ12.0",
+        "docs": "/docs",
+        "endpoints": ["/manifest", "/health", "/evaluate", "/quality", "/v1/rerank"],
+    }
 
 @app.get("/manifest")
 def manifest():