Career transitions now show their evidence

Career transition cards on role pages now carry a small evidence line: how many skills the two roles share (and which ones), and whether official US occupational data classifies them as the same or related occupations.

Every claim is computed from named public sources -- our own skill taxonomy and the US Department of Labor's occupation database -- and dated. Where the sources have nothing to say about a transition, we show nothing rather than invent a reason.

It's the same principle as the salary data we added earlier: real numbers with receipts, or silence.