non-interactive --yes: ask() assumes prompt default (no read); timezone defaults UTC; --username implies force-create; create-user name defaults to mk under --yes

lib/prompt.sh

@@ -2,9 +2,15 @@
 # prompt.sh — plain y/N prompts.
 
 # ask "prompt?" [default y|n]  -> sets REPLY
+# Under ${ALL:-0} (the --yes flag) assume the stated default without
+# reading stdin, so a fully non-interactive run never blocks on a read.
 ask() {
   local p="$1" d="${2:-y}" hint
   if [[ "$d" == "y" ]]; then hint="[Y/n]"; else hint="[y/N]"; fi
+  if (( ${ALL:-0} )); then
+    REPLY="$d"
+    return
+  fi
   read -rp "$p $hint " REPLY
   [[ -z "$REPLY" ]] && REPLY="$d"
 }