first try

src/space-status/block.json

@@ -0,0 +1,13 @@
+{
+  "apiVersion": 3,
+  "name": "wp-spaceapi-consumer/space-status",
+  "title": "Space Status",
+  "description": "Show whether the space is open or closed (SpaceAPI consumer).",
+  "category": "widgets",
+  "icon": "info",
+  "textdomain": "wp-spaceapi-consumer",
+  "style": "file:./style.css",
+  "editorStyle": "file:./editor.css",
+  "editorScript": "file:./index.js",
+  "supports": { "html": false }
+}

src/space-status/index.js

@@ -0,0 +1,12 @@
+import { __ } from '@wordpress/i18n';
+import { registerBlockType } from '@wordpress/blocks';
+import ServerSideRender from '@wordpress/server-side-render';
+
+registerBlockType( 'wp-spaceapi-consumer/space-status', {
+	edit: () => (
+		<ServerSideRender
+			block="wp-spaceapi-consumer/space-status"
+		/>
+	),
+	save: () => null, // dynamic block — markup comes from PHP
+} );

src/space-status/style.css

@@ -0,0 +1 @@
+@import url('../wp-spaceapi-consumer-style.css');