Rework debate prompts, add turn-based rounds and self-elimination convergence

- Round 1 parallel (form positions), Round 2+ sequential turn-based (each model
  sees current round's prior responses before speaking)
- Prompts treat user question as open-ended, not as a debate proposition — models
  form their own thesis in Round 1 then defend it
- Structured opposition: each model defends own unique position, not FOR/AGAINST
- Self-convergence: each model judges if convinced after each round, eliminated
  models drop out, last one standing wins and provides final summary
- Skip convergence/judge checks on Round 1 (still forming positions)
- Auto-save now triggers on councilData/debateData updates so intermediate rounds
  persist across page refresh

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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