diff --git a/CLAUDE.md b/CLAUDE.md
index b729263..bea4311 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -54,7 +54,7 @@ vibesville/
 
 - **Framework:** Yew (Rust compiled to Wasm)
 - **Build tool:** Trunk (`trunk serve` for local dev)
-- **Compile target:** `wasm32-unknown-unknown` (must be installed: `rustup target add wasm32-unknown-unknown`)
+- **Compile target:** `wasm32-unknown-unknown` (included in the Nix dev shell via rust-overlay)
 - **Hosting:** Cloudflare Pages
 
 ### Data
diff --git a/common/Cargo.lock b/common/Cargo.lock
new file mode 100644
index 0000000..bf5cec5
--- /dev/null
+++ b/common/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "common"
+version = "0.1.0"