Show progress while the smoketest waits on a VM

The waits for SSH, GNOME and a reboot say what they're waiting for and
repeat it once a minute, and the base build says when it's waiting for
cloud-init, installing GNOME and shutting down.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/smoketest.bats

@@ -170,3 +170,14 @@ last_run() {
   [[ "$output" == *"base       built"* ]]
   [[ "$output" == *"installed  not built"* ]]
 }
+
+@test "long waits say what they're waiting for, then again once a minute" {
+  run bash -c 'source "$1"; wait_begin "waiting for X"; wait_tick
+    SECONDS=61; wait_tick; wait_tick; SECONDS=125; wait_tick; wait_done' _ "$PROJECT/lib/vm.sh"
+  [ "$status" -eq 0 ]
+  [ "${lines[0]}" = "waiting for X..." ]
+  [ "${lines[1]}" = "  still waiting for X (1 min)" ]
+  [ "${lines[2]}" = "  still waiting for X (2 min)" ]
+  [[ "${lines[3]}" == "  done after "*s ]]
+  [ "${#lines[@]}" -eq 4 ]
+}