添加 UPSTREAM.md 版本追踪，更新 README 区分原创与翻译

- 新增 UPSTREAM.md 记录上游版本、翻译覆盖率和同步策略
- README 中明确标注中国市场智能体为原创而非翻译

README.md

@@ -118,9 +118,9 @@ cp -r agency-agents-zh/* ~/.claude/agents/
 
 ---
 
-## 中国本土化智能体
+## 中国市场原创智能体
 
-以下智能体是本项目原创，专为中国市场和平台定制：
+以下智能体并非翻译，而是专为中国市场和平台打造的全新智能体：
 
 | 智能体 | 平台 | 特色 |
 |--------|------|------|

UPSTREAM.md

@@ -0,0 +1,39 @@
+# Upstream Tracking
+
+This file tracks which version of the upstream [agency-agents](https://github.com/msitarzewski/agency-agents) each translation is based on.
+
+## Current Baseline
+
+- **Upstream repo**: https://github.com/msitarzewski/agency-agents
+- **Upstream commit**: `5e32f1d` (2026-03-07)
+- **Upstream agent count**: 77
+
+## Translation Coverage
+
+| Category | Upstream | Translated | Coverage |
+|----------|----------|------------|----------|
+| design | 7 | 3 | 43% |
+| engineering | 7 | 6 | 86% |
+| marketing | 11 | 3 | 27% |
+| product | 3 | 3 | 100% |
+| project-management | 5 | 0 | 0% |
+| spatial-computing | 6 | 0 | 0% |
+| specialized | 7 | 1 | 14% |
+| strategy | 16 | 0 | 0% |
+| support | 6 | 3 | 50% |
+| testing | 7 | 4 | 57% |
+
+## China-Market Originals (not translations)
+
+These agents are original creations for the Chinese market, not translations of upstream agents:
+
+- `marketing/marketing-xiaohongshu-operator.md` - 小红书运营
+- `marketing/marketing-douyin-strategist.md` - 抖音策略师
+- `marketing/marketing-wechat-operator.md` - 微信公众号运营
+- `specialized/prompt-engineer.md` - Prompt 工程师
+
+## Sync Policy
+
+- Translations track the upstream `main` branch
+- New upstream agents are translated as time permits, priority given to high-demand categories
+- Upstream breaking changes (renames, restructures) are synced within one week