feat: collapse plugin runtime to one tier behind a plugin SDK

scripts/__fixtures__/manifests/invalid-unknown-capability.json

@@ -0,0 +1,16 @@
+{
+  "id": "sample-plugin",
+  "name": "Sample",
+  "version": "1.0.0",
+  "description": "A sample.",
+  "author": {
+    "name": "Termix"
+  },
+  "license": "MIT",
+  "category": "Productivity",
+  "engine": {
+    "termix": ">=2.9.0",
+    "api": "1"
+  },
+  "capabilities": ["hosts.read"]
+}