kernel(rml-compositing): fix Wave-1 test-seam listener lifetime (root cause)

The Wave-1 headless surface-capture test seam attached a commit Listener to
every client wl_surface and only detached at Server teardown, so a client
destroying a surface mid-session tripped wlroots'
wl_list_empty(&surface->events.commit.listener_list) assertion (SIGABRT). This
aborted ext-stage-dock-glue at teardown and forced an in-unit workaround in
ext-xdg-shell-client.

Fix: the per-surface commit Listener is now RAII-scoped to the surface's own
lifetime (dropped on a wlr_surface.events.destroy listener), so it unsubscribes
before the surface resource is destroyed. Test-probe behavior unchanged;
extension-facing contract unchanged.

kernel suite green; ext-stage-dock now GREEN (no teardown SIGABRT); ext-xdg-shell
still green; build-asan kernel green, no new unbox::-framed leak/UB.

0 files changed, 0 insertions, 0 deletions