fed-prims: Phase H — native-only http-listen HTTP/1.1 server + curl test

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

plans/fed-sx-host-primitives.md

@@ -132,7 +132,7 @@ check** → tests → commit → tick box → Progress-log line → push.
 - **Acceptance:** passes; WASM build still links (Sys.readdir is stubbed there).
   Satisfies fed-sx Step 3 segment replay.
 
-### Phase H — HTTP/1.1 server, **native-only** (`bin/sx_server.ml`)
+### Phase H — HTTP/1.1 server, **native-only** (`bin/sx_server.ml`) ✅ DONE
 - Minimal threaded HTTP/1.1: accept loop (`Unix` + `Thread`), parse request
   line + headers + body (Content-Length), build an SX request dict
   `{:method :path :query :headers :body}`, call the SX handler callable, take an
@@ -205,6 +205,14 @@ printf '(epoch 1)\n(crypto-sha256 "abc")\n' | \
 
 _Newest first._
 
+- 2026-05-18 — Phase H: `http-listen` primitive in `bin/sx_server.ml`
+  (NATIVE ONLY — Unix sockets + Thread per connection, Mutex around
+  the shared-runtime handler call; HTTP/1.1, Connection: close;
+  req {:method :path :query :headers :body} → resp {:status :headers
+  :body}). Test `bin/test_http.sh`: curl GET+query / POST+body / 404
+  / custom header — 6/6. NOT in lib, so WASM kernel untouched (boot
+  green); run_tests 4897 unchanged; Erlang 530/530. Satisfies fed-sx
+  Milestone 1 Step 8 transport.
 - 2026-05-18 — Phase G: `file-list-dir` primitive in
   `lib/sx_primitives.ml` (Sys.readdir → sorted names, no "."/"..";
   Sys_error prefixed like file-read, msg carries enoent/enotdir).