docs: update memU Bot section with GitHub reference and "Now open source" (#366)

Author: sairin1202

README.md

@@ -26,15 +26,17 @@ memU **continuously captures and understands user intent**. Even without a comma
 
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-## 🤖 [OpenClaw (Moltbot, Clawdbot) Alternative](https://memu.bot)
+## 🤖 [OpenClaw (Moltbot, Clawdbot) Alternative](https://github.com/NevaMind-AI/memUBot)
 
 <img width="100%" src="https://github.com/NevaMind-AI/memU/blob/main/assets/memUbot.png" />
 
-- **Download-and-use and simple** to get started.
-- Builds long-term memory to **understand user intent** and act proactively.
-- **Cuts LLM token cost** with smaller context.
+**[memU Bot](https://github.com/NevaMind-AI/memUBot)** — Now open source. The enterprise-ready OpenClaw. Your proactive AI assistant that remembers everything.
 
-Try now: [memU bot](https://memu.bot)
+- **Download-and-use and simple** to get started (one-click install, &lt; 3 min).
+- Builds long-term memory to **understand user intent** and act proactively (24/7).
+- **Cuts LLM token cost** with smaller context (~1/10 of comparable usage).
+
+Try now: [memu.bot](https://memu.bot) · Source: [memUBot on GitHub](https://github.com/NevaMind-AI/memUBot)
 
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