Copy benches dir and build only binary

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: Jonathan D.A. Jewell

Dockerfile

@@ -13,8 +13,9 @@ RUN apt-get update && apt-get install -y \
 
 COPY Cargo.toml Cargo.lock* ./
 COPY src/ src/
+COPY benches/ benches/
 
-RUN cargo build --release
+RUN cargo build --release --bin echidna
 
 FROM debian:bookworm-slim