Close retained connectors on worker shutdown

docs/setup.md

@@ -257,6 +257,9 @@ Important settings:
   4 KiB positional read. Cache-miss full-artifact reads use the same checks
   around 64 KiB positional chunks. A single in-progress regular-file syscall
   cannot be cooperatively interrupted; later reads and parsing cannot overrun the budget.
+  Wasmtime's serialized-module deserialization call is also synchronous and
+  cannot be interrupted; if it stalls, the timeout is reported after that call
+  returns rather than at the nominal wall-clock boundary.
   Initial/final descriptor identity, unique selected metadata sections, and
   strict 64-bit LEB high-bit validation reject changed or ambiguous artifacts.