chore: add structured package data for math/base/special/signum

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---

Author: manvith2003

lib/node_modules/@stdlib/math/base/special/signum/package.json

@@ -64,5 +64,84 @@
     "special function",
     "special",
     "function"
-  ]
+  ],
+  "__stdlib__": {
+    "scaffold": {
+      "$schema": "math/[email protected]",
+      "base_alias": "signum",
+      "alias": "signum",
+      "pkg_desc": "evaluate the signum function for a double-precision floating-point number",
+      "desc": "evaluates the signum function for a double-precision floating-point number",
+      "short_desc": "signum",
+      "parameters": [
+        {
+          "name": "x",
+          "desc": "input value",
+          "type": {
+            "javascript": "number",
+            "jsdoc": "number",
+            "c": "double",
+            "dtype": "float64"
+          },
+          "domain": [
+            {
+              "min": "-infinity",
+              "max": "infinity"
+            }
+          ],
+          "rand": {
+            "prng": "random/base/uniform",
+            "parameters": [
+              -100,
+              100
+            ]
+          },
+          "example_values": [
+            -100,
+            -50,
+            -10,
+            -5,
+            -3.5,
+            -1,
+            -0.5,
+            -0.1,
+            0,
+            0.1,
+            0.5,
+            1,
+            3.5,
+            5,
+            10,
+            25,
+            50,
+            75,
+            100,
+            -75
+          ]
+        }
+      ],
+      "output_policy": "real_floating_point_and_generic",
+      "returns": {
+        "desc": "signum",
+        "type": {
+          "javascript": "number",
+          "jsdoc": "number",
+          "c": "double",
+          "dtype": "float64"
+        }
+      },
+      "keywords": [
+        "signum",
+        "sign",
+        "value",
+        "number",
+        "special function",
+        "special",
+        "function"
+      ],
+      "extra_keywords": [
+        "math.sign"
+      ]
+    }
+  }
 }