feat: finish the fleets plugin, add ctx.hosts and host-commands SDK (B4)

plugins/ai/manifest.json

@@ -32,7 +32,8 @@
   "optionalDependencies": {
     "workspaces": "^1.0.0",
     "network-topology": "^1.0.0",
-    "snippets": "^1.0.0"
+    "snippets": "^1.0.0",
+    "fleets": "^1.0.0"
   },
   "requires": [
     {
@@ -49,6 +50,11 @@
       "service": "snippets.access",
       "versionRange": "^1.0.0",
       "optional": true
+    },
+    {
+      "service": "fleets.access",
+      "versionRange": "^1.0.0",
+      "optional": true
     }
   ],
   "providesSecret": [