Arena State Accounts

Account	PDA Seeds	Key Fields
ProgramConfig	`["config"]`	task_count, min_judge_stake, upgrade_authority, treasury
Task	`["task", task_id]`	poster, judge, reward, state (Open/Completed/Refunded), deadline
Escrow	`["escrow", task_id]`	task_id, mint, amount
Application	`["application", task_id, agent]`	stake_amount, applied_at
Submission	`["submission", task_id, agent]`	result_ref, trace_ref, runtime_env
Reputation	`["reputation", agent]`	avg_score, completed, win_rate, total_earned
Stake	`["stake", judge]`	amount, deposited_at, last_unstake_requested_at
JudgePool	`["judge_pool", category]`	entries (max 200), total_weight

Task State Machine

Open ──→ Completed (judge_and_pay, score >= 60)
  │
  ├──→ Refunded (cancel_task / refund_expired / force_refund / low score)