docs: update all remaining files for v1.4.0 upstream migrations

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/README_en.md

@@ -76,7 +76,7 @@ Update Agent Reach: https://raw.githubusercontent.com/Panniantong/agent-reach/ma
 | 📺 **YouTube** | Read · **Search** | Zero config | Subtitles + search across 1800+ video sites ([yt-dlp](https://github.com/yt-dlp/yt-dlp) ⭐148K) |
 | 📺 **Bilibili** | Read · **Search** | Zero config / Proxy | Video info + subtitles + search. Local works directly, servers need a proxy ([yt-dlp](https://github.com/yt-dlp/yt-dlp)) |
 | 📡 **RSS** | Read | Zero config | Any RSS/Atom feed ([feedparser](https://github.com/kurtmckee/feedparser) ⭐2.3K) |
-| 📖 **Reddit** | Search · Read | Zero config | Search and read via Exa (free, no proxy needed) |
+| 📖 **Reddit** | Search · Read | Zero config | Search and read via [rdt-cli](https://github.com/public-clis/rdt-cli) (free, no proxy needed) |
 
 > **Setup levels:** Zero config = install and go · Auto-configured = handled during install · mcporter = needs MCP service · Cookie = export from browser · Proxy = $1/month
 
@@ -147,7 +147,7 @@ Tell your Agent "help me configure Twitter cookies" — it'll guide you through
 
 Bilibili blocks server IPs. Get a proxy ([Webshare](https://webshare.io) recommended, $1/month) and send the address to your Agent.
 
-> Reddit now works free via Exa without any proxy. Local computers don't need a proxy for Bilibili either.
+> Reddit now works free via rdt-cli without any proxy. Local computers don't need a proxy for Bilibili either.
 
 ---
 
@@ -171,7 +171,7 @@ $ agent-reach doctor
   ⬜ Web semantic search — sign up at exa.ai for free key
 
 🔧 Configurable:
-  ✅ Reddit posts and comments — search and read via Exa (free, no proxy)
+  ✅ Reddit posts and comments — search and read via rdt-cli (free, no proxy)
   ⬜ XiaoHongShu notes — needs cookie. Export from browser
 
 Status: 6/9 channels available
@@ -200,7 +200,7 @@ channels/
 ├── youtube.py      → yt-dlp          ← swap to YouTube API, Whisper…
 ├── github.py       → gh CLI          ← swap to REST API, PyGithub…
 ├── bilibili.py     → yt-dlp          ← swap to bilibili-api…
-├── reddit.py       → Exa             ← search + read, no proxy needed
+├── reddit.py       → rdt-cli          ← search + read, no proxy needed
 ├── xiaohongshu.py  → mcporter MCP    ← swap to other XHS tools…
 ├── douyin.py       → mcporter MCP    ← swap to other Douyin tools…
 ├── linkedin.py     → linkedin-mcp    ← swap to LinkedIn API…