builder: add native Cargo service and world CLI

host/src/process/http.rs

@@ -45,9 +45,14 @@ impl WasiHttpHooks for Hooks {
                 .is_some_and(|h| h.eq_ignore_ascii_case("host.sausage"))
             {
                 let bytes = body.collect().await?.to_bytes();
-                return Ok(response(
-                    crate::api::handle(&router, caller, Request::from_parts(parts, bytes)).await,
-                ));
+                let request = Request::from_parts(parts, bytes);
+                if request.method() == http::Method::POST && request.uri().path() == "/cargo" {
+                    return Ok((
+                        crate::api::stream(&router, request),
+                        Box::new(async { Ok(()) }),
+                    ));
+                }
+                return Ok(response(crate::api::handle(&router, caller, request).await));
             }
             if !matches!(parts.uri.scheme_str(), Some("http" | "https")) {
                 while let Some(frame) = body.frame().await {

host/src/process/mod.rs

@@ -191,6 +191,10 @@ impl Runtime {
                 "http://localhost:8081",
             )?),
         };
+        let _ = router.builder.set(Arc::new(crate::builder::Builder::new(
+            world.root.clone(),
+            &world.host_dir,
+        )?));
         let network = Arc::new(net::NetPolicy::open(&world.host_dir)?);
         let engine = compiler.engine.clone();
         let alive = Arc::new(AtomicBool::new(true));