Add in-guest acceptance test suite

Runs inside a live Omarchy session (typically a VM installed by
omarchy-iso-test) and verifies the desktop actually works: session
health, application launches by window class, and shell surfaces via
IPC — including typing into the launcher and launching the top hit.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/acceptance.d/shell-surfaces-test.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
+
+open_and_close() {
+  local name="$1" plugin="$2" namespace="$3" payload="${4:-}"
+
+  if [[ -n $payload ]]; then
+    omarchy-shell shell summon "$plugin" "$payload" >/dev/null
+  else
+    omarchy-shell shell summon "$plugin" >/dev/null
+  fi
+
+  wait_until "$name opens" 15 layer_present "$namespace"
+  sleep 1
+  screenshot "$name-open"
+
+  omarchy-shell shell hide "$plugin" >/dev/null
+  wait_until "$name closes" 15 layer_absent "$namespace"
+}
+
+# Overlays open and close on IPC command
+open_and_close "emoji-picker" omarchy.emojis omarchy-emojis
+open_and_close "menu" omarchy.menu omarchy-menu '{"menu":"root"}'
+open_and_close "clipboard" omarchy.clipboard omarchy-clipboard
+
+# The launcher does the full loop: open, search by typing, launch the top hit
+if window_present "org.gnome.Calculator" >/dev/null 2>&1; then
+  fail "launcher test starts with no calculator window" "a calculator window is already open"
+fi
+
+omarchy-shell shell summon omarchy.launcher >/dev/null
+wait_until "launcher opens" 15 layer_present "omarchy-launcher"
+sleep 1
+screenshot "launcher-open"
+
+wtype "calculator"
+sleep 1
+screenshot "launcher-search"
+wtype -k Return
+
+wait_until "launcher launches the top search hit" 60 window_present "org.gnome.Calculator"
+wait_until "launcher closes after launching" 15 layer_absent "omarchy-launcher"
+
+close_windows "org.gnome.Calculator"
+wait_until "calculator window closes" 30 window_absent "org.gnome.Calculator"