feat(core-eslint): conformance plugin module + ./plugin export

packages/core-eslint/package.json

@@ -6,7 +6,8 @@
   "exports": {
     "./base": "./base.js",
     "./next": "./next.js",
-    "./react-internal": "./react-internal.js"
+    "./react-internal": "./react-internal.js",
+    "./plugin": "./plugin.js"
   },
   "scripts": {
     "test": "vitest run --passWithNoTests"

packages/core-eslint/plugin.js

@@ -0,0 +1,27 @@
+import featureMustHaveManifest from "./rules/feature-must-have-manifest.js";
+import usecaseMustHaveTestFile from "./rules/usecase-must-have-test-file.js";
+import requiredCoresInstalled from "./rules/required-cores-installed.js";
+
+/**
+ * The `@repo/core-eslint` conformance plugin. Aggregates custom rules that
+ * enforce feature-conformance contracts (manifest presence, sibling tests,
+ * required-cores ↔ workspace consistency).
+ *
+ * Registered as the `conformance` plugin in flat config:
+ *
+ *   import conformancePlugin from "@repo/core-eslint/plugin";
+ *   export default [
+ *     { plugins: { conformance: conformancePlugin } },
+ *     { rules: { "conformance/feature-must-have-manifest": ["warn", { repoRoot: import.meta.dirname }] } },
+ *   ];
+ */
+const plugin = {
+  meta: { name: "conformance", version: "0.1.0" },
+  rules: {
+    "feature-must-have-manifest": featureMustHaveManifest,
+    "usecase-must-have-test-file": usecaseMustHaveTestFile,
+    "required-cores-installed": requiredCoresInstalled,
+  },
+};
+
+export default plugin;