feat: Add core models and protocol definitions for NxMesh

crates/nxmesh-proto/build.rs

@@ -0,0 +1,9 @@
+use std::io::Result;
+
+fn main() -> Result<()> {
+    tonic_build::configure()
+        .build_server(true)
+        .build_client(true)
+        .compile(&["proto/agent.proto"], &["proto"])?;
+    Ok(())
+}