fix: escape @discordjs/* in KDoc and fix instance check warning

Author: akapug

packages/graalvm-js/src/main/kotlin/elide/runtime/lang/javascript/PackageExportsResolver.kt

@@ -251,9 +251,8 @@ internal object PackageExportsResolver {
     return try {
       JSObject.enumerableOwnNames(obj).mapNotNull { key ->
         when (key) {
-          is String -> key
           is com.oracle.truffle.api.strings.TruffleString -> key.toJavaStringUncached()
-          else -> null
+          else -> key?.toString()
         }
       }
     } catch (e: Exception) {

packages/graalvm/src/test/kotlin/elide/runtime/gvm/js/vfs/JsPackageExportsTest.kt

@@ -138,7 +138,7 @@ import elide.util.UUID
   /**
    * Test: Import from a package with nested conditional exports (the main fix).
    *
-   * This is the pattern used by @discordjs/* packages that caused the original issue.
+   * This is the pattern used by `@discordjs/*` packages that caused the original issue.
    *
    * package.json:
    * {