chore(lint): enable import/no-cycle

Guards against circular-dependency regressions in barrels. Requires the
import plugin, which is not enabled by default.

oxlint.json

@@ -1,4 +1,5 @@
 {
+  "plugins": ["import"],
   "categories": {
     "correctness": "error",
     "suspicious": "warn",
@@ -22,6 +23,7 @@
   "rules": {
     "no-console": "off",
     "no-debugger": "error",
-    "no-alert": "warn"
+    "no-alert": "warn",
+    "import/no-cycle": "error"
   }
 }