fix: inline constant value

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---

Author: kgryte

lib/node_modules/@stdlib/stats/base/dists/halfnormal/mean/manifest.json

@@ -39,9 +39,7 @@
       "libpath": [],
       "dependencies": [
         "@stdlib/math/base/napi/unary",
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt",
-        "@stdlib/constants/float64/pi"
+        "@stdlib/math/base/assert/is-nan"
       ]
     },
     {
@@ -56,9 +54,7 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt",
-        "@stdlib/constants/float64/pi"
+        "@stdlib/math/base/assert/is-nan"
       ]
     },
     {
@@ -73,9 +69,7 @@
       "libraries": [],
       "libpath": [],
       "dependencies": [
-        "@stdlib/math/base/assert/is-nan",
-        "@stdlib/math/base/special/sqrt",
-        "@stdlib/constants/float64/pi"
+        "@stdlib/math/base/assert/is-nan"
       ]
     }
   ]

lib/node_modules/@stdlib/stats/base/dists/halfnormal/mean/src/main.c

@@ -18,10 +18,8 @@
 
 #include "stdlib/stats/base/dists/halfnormal/mean.h"
 #include "stdlib/math/base/assert/is_nan.h"
-#include "stdlib/math/base/special/sqrt.h"
-#include "stdlib/constants/float64/pi.h"
 
-static const double SQRT_TWO_OVER_PI = stdlib_base_sqrt( 2.0 / STDLIB_CONSTANT_FLOAT64_PI );
+static const double SQRT_TWO_OVER_PI = 0.7978845608028654; // sqrt(2/π)
 
 /**
 * Returns the expected value for a half-normal distribution with scale parameter `sigma`.