flush runtime diagnostics promptly

docs/wasm-runtime-architecture.md

@@ -402,6 +402,11 @@ header free-functions are `inline`. The wasm backend exposes only declarations
   independently enforces the same canonical identity, and persisted failures
   are reused only when their recorded source path matches the current request.
 
+- **Log timeliness**: the base process line-buffers stdout before forking
+  workers, the proactive compiler, and the WebSocket broker. This keeps each
+  newline-terminated diagnostic attached to its actual journal time instead of
+  releasing an old block-buffered failure during unrelated later traffic.
+
 - **WebSocket end-to-end**: a headless client performs a raw WS handshake to
   `:HTTP_PORT` with path `/site/tests/websockets.ws.uce` (self-resolving
   `SCRIPT_FILENAME`) and asserts the `hello-ack` frame — exercising the full