Slice 2: tinywl port — kernel compositor runs nested, manages toplevels, touch added

Server contract (pimpl, create/run/dispatch/terminate) over a faithful
tinywl 0.20.1 port: outputs via wlr_scene, xdg-shell toplevels+popups,
focus, interactive move/resize, keyboard/pointer through wlr_cursor — plus
touch (down/up/motion/cancel/frame via seat notifies with per-point origin
tracking), which tinywl lacks. RAII Listener replaces manual wl_list_remove
bookkeeping; shutdown ordering documented in kernel.md. xkbcommon added as
a system dep. Verified: nested under labwc (output WL-1, foot mapped and
focused on GLES2) and a headless+pixman boot test in the kernel suite.

1 files changed, 16 insertions, 0 deletions

diff --git a/packages/kernel/tests/test_kernel.cpp b/packages/kernel/tests/test_kernel.cpp
index ebcfbc3..0172901 100644
--- a/packages/kernel/tests/test_kernel.cpp
+++ b/packages/kernel/tests/test_kernel.cpp
@@ -2,6 +2,9 @@
 #include <doctest/doctest.h>
 
 #include <unbox/kernel/kernel.hpp>
+#include <unbox/kernel/server.hpp>
+
+#include <cstdlib>
 
 TEST_CASE("kernel compiles against and links wlroots + libwayland-server") {
     CHECK(unbox::kernel::link_probe());
@@ -11,3 +14,16 @@ TEST_CASE("kernel compiles against and links wlroots + libwayland-server") {
 TEST_CASE("vendored RMLUi subproject compiled and linked") {
     CHECK(!unbox::kernel::rmlui_version().empty());
 }
+
+TEST_CASE("server boots and shuts down on the headless backend") {
+    // Headless backend + pixman renderer: no GPU, no parent session needed.
+    setenv("WLR_BACKENDS", "headless", 1);
+    setenv("WLR_RENDERER", "pixman", 1);
+
+    auto server = unbox::kernel::Server::create({});
+    CHECK(!server->socket_name().empty());
+    for (int i = 0; i < 3; ++i) {
+        CHECK(server->dispatch(10));
+    }
+    // Destruction runs the full tinywl shutdown sequence.
+}