README: unlock the board at 3 total votes (was 3 per case)

Match the site change — the community leaderboard now unlocks after 3 votes
in any mix of cases, not 3 in each.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.en.md

@@ -48,7 +48,7 @@ Pending: Mistral Medium 3.5 · GLM-5.1 · Qwen3.7-Max (PRs welcome)
 ## Arena blind battles & community board
 
 - Each case defaults to **Arena mode**: two anonymous artifacts battle (A / B / Neither) and identities reveal only after you vote; switch to **Demo Show** to browse everything (tabs are grouped by model — a model with several harnesses can be viewed singly or side by side).
-- Casting 03 votes in each case unlocks the **community leaderboard**, ranked by Bradley-Terry scores (the LMSYS Chatbot Arena approach); "neither" counts separately as both-bad.
+- Casting 03 votes total unlocks the **community leaderboard**, ranked by Bradley-Terry scores (the LMSYS Chatbot Arena approach); "neither" counts separately as both-bad.
 - Votes stay in the browser by default; deploying `worker/` (Cloudflare Worker + D1 + Turnstile, free tier) upgrades the board to sitewide crowdsourced data — see [worker/README.md](./worker/README.md).
 
 ## Structure

README.md

@@ -48,7 +48,7 @@ NAGI STUDIO 的 LLM 测评案例集：同一段提示词，不同「模型 × Ha
 ## Arena 盲评与社区榜单
 
 - 每个案例默认进入 **Arena 模式**：随机抽两份产出匿名对战（A / B / 都不好），投完票才揭晓身份；右上角可切到 **全部查看**（按模型分组浏览，同一模型多个 Harness 可单看或并排对比）。
-- 在两个案例各投满 03 票后解锁**社区榜单**：按 Bradley-Terry 评分排名（LMSYS Chatbot Arena 同思路），「都不好」单独计入双败。
+- 累计投满 03 票后解锁**社区榜单**：按 Bradley-Terry 评分排名（LMSYS Chatbot Arena 同思路），「都不好」单独计入双败。
 - 投票默认存浏览器本地；部署 `worker/`（Cloudflare Worker + D1 + Turnstile 防刷，免费档即可）后自动升级为全站众包数据，步骤见 [worker/README.md](./worker/README.md)。
 
 ## 结构 / Structure