Add Cargo workspace, crate skeletons and the gate

Implemented-By: Laguna S 2.1 (OpenCode)

crates/inferproxy/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "inferproxy"
+version = "0.1.0"
+edition.workspace = true
+rust-version.workspace = true
+publish.workspace = true
+
+[lints]
+workspace = true
+
+[dependencies]
+proto.workspace = true

crates/inferproxy/src/lib.rs

@@ -0,0 +1 @@
+//! Forwards bytes between `infer.sock` and the llama-server router. It logs nothing.

crates/inferproxy/src/main.rs

@@ -0,0 +1,4 @@
+fn main() {
+    eprintln!("inferproxy: not implemented until M2");
+    std::process::exit(2);
+}