docs(spec): swallow pattern reassigned — the file manager is dirvish, not nautilus

Craig corrected the target: Super+F opens the dirvish popup (an Emacs frame), so the swallow belongs in elisp, where it's strictly better — Emacs launches the viewer, so a directly-spawned handler plus a process sentinel gives exact hide/restore and a failure notify, no window-event heuristics. Spec cancelled with the gio double-fork finding kept for reference; task closed as reassigned.

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