leaderboard: add avg_cost_per_task_usd column for V2 hermes rows

fix: restore deepseek-v4-flash:free Total=129 per canonical table (concurrent edit set it to 130)

fix: reorder V2 hermes rows to match website (owl@5, glm-air@6, dsflash@7, minimax@8); dsflash total 129->130

feat: add reward_rate_strict column for 8 V2 hermes rows (lenient/strict alignment)

Update V2 hermes leaderboard rows with ds-v4-pro lenient judge (2026-05-20)

V2: Hermes-only — drop glm-5.1 openclaw row (alt harnesses tracked separately)

Refresh leaderboard: 7 V2 + 6 V1 rows with reward_rate (judge-graded)

Refresh results.csv: 7 V2 + 6 V1 rows with reward_rate (judge-graded)

Duplicate from NAIL-Group/ClawBench