docs(todo): file Fn+F9 pocketbook task, close paru-vs-yay defect

Filed a [#C] task for the Fn+F9-toggles-pocketbook behavior on velox, with the investigation findings: the trigger isn't in any Hyprland bind, remapper, or pocketbook's own source, so it's parked until it resurfaces.

Also closed the paru-vs-yay research task properly: it had been left as a level-2 dated header, which is a sub-task shape, so it became DONE + CLOSED.

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