chore: lock the plugin boundary and remove 2.9.0 leftovers

plugins/homepage/src/frontend/HomepageApp.tsx

@@ -1,12 +0,0 @@
-import React from "react";
-import { HomepageCanvas } from "./HomepageCanvas";
-
-const HomepageApp: React.FC = () => {
-  return (
-    <div className="h-screen w-screen overflow-hidden">
-      <HomepageCanvas fitOnLoad={true} />
-    </div>
-  );
-};
-
-export default HomepageApp;

plugins/homepage/src/frontend/registry.ts

@@ -1,77 +0,0 @@
-import { useSyncExternalStore } from "react";
-
-/**
- * A keyed, reactive list of contributions.
- *
- * Widgets register on import, so anything rendered from a registry has to
- * re-render when it changes. The snapshot array is cached until the next
- * change because useSyncExternalStore compares by identity and loops forever
- * on a fresh array.
- */
-export interface Registry<T extends { id: string }> {
-  /** Adds or replaces by id. The disposer only removes this exact entry. */
-  register: (item: T) => () => void;
-  unregister: (id: string) => void;
-  get: (id: string) => T | undefined;
-  list: () => T[];
-  subscribe: (listener: () => void) => () => void;
-  /** React hook over list(). */
-  useList: () => T[];
-  reset: () => void;
-}
-
-export function createRegistry<T extends { id: string }>(
-  sort?: (a: T, b: T) => number,
-): Registry<T> {
-  const items = new Map<string, T>();
-  const listeners = new Set<() => void>();
-  let snapshot: T[] | null = null;
-
-  const emit = () => {
-    snapshot = null;
-    for (const listener of listeners) listener();
-  };
-
-  const list = () => {
-    if (!snapshot) {
-      snapshot = [...items.values()];
-      if (sort) snapshot.sort(sort);
-    }
-    return snapshot;
-  };
-
-  const subscribe = (listener: () => void) => {
-    listeners.add(listener);
-    return () => {
-      listeners.delete(listener);
-    };
-  };
-
-  return {
-    register(item) {
-      items.set(item.id, item);
-      emit();
-      return () => {
-        if (items.get(item.id) === item) {
-          items.delete(item.id);
-          emit();
-        }
-      };
-    },
-    unregister(id) {
-      if (items.delete(id)) emit();
-    },
-    get(id) {
-      return items.get(id);
-    },
-    list,
-    subscribe,
-    useList() {
-      return useSyncExternalStore(subscribe, list, list);
-    },
-    reset() {
-      items.clear();
-      emit();
-    },
-  };
-}