refactor: remove time demo script and update hello script metadata/params

scripts/hello.hub.kts

@@ -1,17 +1,19 @@
+// @desc: hello
+// @timeout: 10s
+// @param: name   | default=world | desc=hello <name> | required=false
+// @param: upper  | default=false | desc=upper text   | required=true
 import java.time.LocalDateTime
 
-// @desc: Demo greeting API
-// @param: name | default=world | desc=Name to greet
-// @param: upper | default=false | desc=Uppercase output
-
 val args: Array<String> = emptyArray()
-val kv = args.mapNotNull {
+val kv =
+    args
+        .mapNotNull {
             val idx = it.indexOf('=')
             if (idx <= 0) null else it.substring(0, idx) to it.substring(idx + 1)
-}.toMap()
+        }.toMap()
 
 val name = kv["name"] ?: "world"
-val upper = (kv["upper"] ?: "false").toBoolean()
+val upper = (kv["upper"]!!).toBoolean()
 val message = "Hello, $name @ ${LocalDateTime.now()}"
 
 println(if (upper) message.uppercase() else message)

scripts/time.hub.kts

@@ -1,2 +0,0 @@
-import java.time.LocalDateTime
-println("time=" + LocalDateTime.now())