feat: warn and suggest install for opt-in launch commands

packages/contentstack/package.json

@@ -156,7 +156,8 @@
       ],
       "init": [
         "./lib/hooks/init/context-init",
-        "./lib/hooks/init/utils-init"
+        "./lib/hooks/init/utils-init",
+        "./lib/hooks/init/opt-in-plugin-guide"
       ]
     }
   },

packages/contentstack/src/hooks/init/opt-in-plugin-guide.ts

@@ -0,0 +1,38 @@
+import { Hook } from '@oclif/core';
+import { cliux } from '@contentstack/cli-utilities';
+
+/**
+ * Commands whose plugins used to ship bundled with the CLI but are now opt-in.
+ * Keyed by oclif topic (the segment before the first `:` in a command id).
+ */
+const DEMOTED_PLUGINS: Record<string, string> = {
+  launch: '@contentstack/cli-launch',
+};
+
+/**
+ * When a user runs a command belonging to a demoted (now opt-in) plugin that
+ * is not installed, warn them and point to the install command instead of
+ * letting the generic "command not found" handler report it as a typo. Runs on
+ * `init`, before command resolution, so it pre-empts `@oclif/plugin-not-found`.
+ */
+const hook: Hook<'init'> = async function (opts): Promise<void> {
+  if (!opts.id) return;
+
+  const topic = opts.id.split(':')[0];
+  const pluginName = DEMOTED_PLUGINS[topic];
+  if (!pluginName) return;
+
+  // If the plugin is already installed, let normal command resolution proceed.
+  if (this.config.plugins.has(pluginName)) return;
+
+  cliux.print(
+    `\nWarning: "${topic}" is now an opt-in plugin and is not installed, so "${topic}:*" commands are unavailable.`,
+    { color: 'yellow' },
+  );
+  cliux.print('\nInstall it to enable these commands:', { color: 'yellow' });
+  cliux.print(`  csdx plugins:install ${pluginName}\n`, { color: 'green' });
+
+  this.exit(127);
+};
+
+export default hook;