Deduplicate plugin capabilities

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/shared/src/constants.ts

@@ -628,7 +628,6 @@ export const PLUGIN_CAPABILITIES = [
   "issue.comments.read",
   "issue.documents.read",
   "agents.read",
-  "agents.managed",
   "goals.read",
   "goals.create",
   "goals.update",

packages/shared/src/validators/plugin.test.ts

@@ -1,6 +1,13 @@
 import { describe, expect, it } from "vitest";
+import { PLUGIN_CAPABILITIES } from "../constants.js";
 import { pluginUiSlotDeclarationSchema } from "./plugin.js";
 
+describe("plugin capability constants", () => {
+  it("exposes each capability once", () => {
+    expect(new Set(PLUGIN_CAPABILITIES).size).toBe(PLUGIN_CAPABILITIES.length);
+  });
+});
+
 describe("plugin UI slot validators", () => {
   it("accepts route-scoped sidebar slots with a routePath", () => {
     const parsed = pluginUiSlotDeclarationSchema.parse({