Fix roll correction, closes #1

source/config.h

@@ -164,6 +164,7 @@ extern const float BATT_CRITICAL;
 // ─── Global state ─────────────────────────────────────────────────────────────
 extern float angleX, angleY;
 extern float accumX, accumY;
+extern float gravX, gravY, gravZ;
 extern float biasGX, biasGY, biasGZ;
 extern float calTempC;
 extern float cachedTempC;