hst: reword and move constants

These values are considered part of the stable, exported API, so move them to hst.

Signed-off-by: Ophestra <cat@gensokyo.uk>

dist/comp/_hakurei

@@ -54,8 +54,8 @@ __hakurei_instances() {
 {
   local -a _hakurei_cmds
   _hakurei_cmds=(
-    "app:Load app from configuration file"
-    "run:Configure and start a permissive default sandbox"
+    "app:Load and start container from configuration file"
+    "run:Configure and start a permissive container"
     "show:Show live or local app configuration"
     "ps:List active instances"
     "version:Display version information"