fix(ls-api): fix smoke test on Apple Silicon, improve container debug output

Two fixes:

1. Add --platform linux/amd64 to docker run so Docker always pulls the
   x86_64 image. On Apple Silicon, Docker otherwise selects the arm64
   image, causing an exec format error when mounting the linux/amd64 RIE
   binary -- the container exits immediately without sending any callbacks.

2. Drop --rm and do explicit docker rm in cleanup instead. With --rm the
   container and its logs are deleted on exit before wait_for_log can
   retrieve them, making failures invisible. Without --rm, docker logs and
   docker inspect work correctly even after the container has stopped.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: joe4dev

cmd/ls-api/smoke-test.sh

@@ -18,7 +18,10 @@ CID_FILE=$(mktemp -t rie-smoke.XXXXXX)
 cleanup() {
     local cid
     cid=$(cat "$CID_FILE" 2>/dev/null || true)
-    [ -n "$cid" ] && docker stop "$cid" 2>/dev/null || true
+    if [ -n "$cid" ]; then
+        docker stop "$cid" 2>/dev/null || true
+        docker rm -f "$cid" 2>/dev/null || true
+    fi
     [ -n "${MOCK_PID:-}" ] && kill "$MOCK_PID" 2>/dev/null || true
     rm -f "$LOG_FILE" "$CID_FILE"
 }
@@ -55,7 +58,8 @@ for i in $(seq 1 10); do nc -z localhost $MOCK_PORT 2>/dev/null && break || slee
 echo ">>> Starting RIE in Docker"
 
 docker_opts=(
-    --rm --detach
+    --detach
+    --platform linux/amd64
     --add-host=host.docker.internal:host-gateway
     -p "$INTEROP_PORT:$INTEROP_PORT"
     -v "$RIE_BINARY:/var/rapid/init:ro"