arkibPRU research tools: swing, head-to-head, simulation

Open Research in arkibPRU to find:

• Statistics, Analysis, States, Parties — summaries by election, state and party.
• Votes vs seats — how vote share turned into seats.
• Swing — vote movement and seats that changed hands between the last two full elections.
• Traditional seats — each party's winning record per seat.
• Strength map — where each party is strong.
• Near wins, Head-to-head, Demographics, Records.
• Simulation — model the next election by moving votes between parties.