Fix formatting in README.md for clarity

Author: ivan-magda

README.md

@@ -92,7 +92,9 @@ The features that make an agent feel like a usable product: context, memory mana
 
 Two-target Swift Package Manager project:
 
-**Core** is the library — API client, shell executor, agent loop, tools, everything testable. **cli** is just the entry point. The executable is called `claude`.
+**Core** is the library — API client, shell executor, agent loop, tools, everything testable.
+
+**CLI** is just the entry point. The executable is called `claude`.
 
 Raw HTTP to `POST https://api.anthropic.com/v1/messages` using [AsyncHTTPClient](https://github.com/swift-server/async-http-client). Works on both macOS and Linux.