A sense of an ending is pervading Irish politics. And it’s not just the closing of the year. Sinn Féin the noisiest, most boisterous party in Ireland, has gone strangely silent. Since the tallies on election 2024 were shut away two weeks ago, apart from a token attempt at left-wing government formation, they have retreated. Why?  Does a poorer-than-anticipated result in the election explain all? If it were as simple as that, Taoiseach Simon Harris would be taking a vow of silence.  Political pundits have bridged the gap with speculation about the future of the party’s leader Mary Lou MacDonald –…