docs: add English stubs for research plan and free source setup

docs/free_source_setup.md

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+# Free data source setup
+
+[简体中文](free_source_setup.zh-CN.md)
+
+## Shipped files
+
+- `config/free_rss_feeds.csv`: official RSS feeds that need no account.
+- `config/core_us_equity_aliases.csv`: core US equity watchlist aliases.
+- `data/live/political_watchlist.csv`: initial watchlist for the live publish path.
+- `data/live/source_items.csv`: latest raw text pulled by the scheduled RSS pipeline.
+- `data/live/source_events.csv`: events extracted deterministically from `source_items.csv`.
+- `data/live/political_events.csv`: stable Advisor input, refreshed by RSS/source pipeline or maintained after manual review.
+- `data/live/source_tracker.csv`: merged watchlist and event tracker.
+
+See the Chinese setup note for cron wiring, refresh commands, and operator checks.

docs/free_source_setup.zh-CN.md

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 # 免费数据源配置
 
+[English](free_source_setup.md)
+
 ## 已落地文件
 
 - `config/free_rss_feeds.csv`：无需账号的官方 RSS 源。

docs/research_plan.md

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+# Political event tracking research plan
+
+[简体中文](research_plan.zh-CN.md)
+
+## Goal
+
+Test whether public figure position disclosures, official public mentions, policy
+funding events, and short-to-medium-term US equity returns show a reproducible
+relationship.
+
+Working hypothesis:
+
+1. Signals appear first in public holdings or trade disclosures.
+2. They surface next in official speeches, announcements, White House materials, or media leads.
+3. Market reaction shows up later in price action, earnings, government procurement, or analyst events.
+
+See the Chinese plan for data sources, evaluation windows, and milestone checklist.

docs/research_plan.zh-CN.md

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 # 政治事件追踪研究计划
 
+[English](research_plan.md)
+
 ## 目标
 
 验证公开人物持仓披露、官方公开点名、政策资金事件与美股短中期收益之间是否存在可复现关系。