docs: drop the "two packages in one monorepo" tagline from the intro

Change-Id: I8821e66a8d7bbddcc4ad8ff11f9f32cf7ec5208c
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Thomas Kosiewski <tk@coder.com>

Author: ThomasK33

README.md

@@ -2,7 +2,7 @@
 
 **Coder's integrations with the [Vercel AI SDK](https://ai-sdk.dev).** Run coding
 agents inside Coder workspaces, and drive Coder's server-side agent runtime from
-AI SDK code — two small, focused packages in one monorepo.
+AI SDK code.
 
 > [!NOTE]
 > Both packages are pre-1.0 and track experimental upstreams (the AI SDK harness