docs(demo): clarify embedded vs server version in README note

Colab notebooks use coordinode-embedded bundling coordinode-rs v0.3.13.
Docker Compose stack uses the CoordiNode server image v0.3.14.
These are separate version lines — make the distinction explicit.

Author: polaz

demo/README.md

@@ -13,7 +13,8 @@ Interactive notebooks for LlamaIndex, LangChain, and LangGraph integrations.
 
 > **Note:** First run installs `coordinode-embedded` from source (Rust build, ~5 min).
 > Subsequent runs use Colab's pip cache.
-> Notebooks are pinned to a specific commit that bundles coordinode-rs v0.3.13.
+> Notebooks are pinned to a specific commit that bundles coordinode-rs v0.3.13 (embedded engine used in Colab).
+> The Docker Compose stack below uses the CoordiNode **server** image v0.3.14.
 
 ## Run locally (Docker Compose)