refactor: route channel runtime via plugin api

src/plugins/runtime.ts

@@ -1,17 +1,55 @@
 import type { PluginRegistry } from "./registry.js";
 
-let activeRegistry: PluginRegistry | null = null;
-let activeRegistryKey: string | null = null;
+const createEmptyRegistry = (): PluginRegistry => ({
+  plugins: [],
+  tools: [],
+  hooks: [],
+  typedHooks: [],
+  channels: [],
+  providers: [],
+  gatewayHandlers: {},
+  httpHandlers: [],
+  cliRegistrars: [],
+  services: [],
+  diagnostics: [],
+});
+
+const REGISTRY_STATE = Symbol.for("clawdbot.pluginRegistryState");
+
+type RegistryState = {
+  registry: PluginRegistry | null;
+  key: string | null;
+};
+
+const state: RegistryState = (() => {
+  const globalState = globalThis as typeof globalThis & {
+    [REGISTRY_STATE]?: RegistryState;
+  };
+  if (!globalState[REGISTRY_STATE]) {
+    globalState[REGISTRY_STATE] = {
+      registry: createEmptyRegistry(),
+      key: null,
+    };
+  }
+  return globalState[REGISTRY_STATE] as RegistryState;
+})();
 
 export function setActivePluginRegistry(registry: PluginRegistry, cacheKey?: string) {
-  activeRegistry = registry;
-  activeRegistryKey = cacheKey ?? null;
+  state.registry = registry;
+  state.key = cacheKey ?? null;
 }
 
 export function getActivePluginRegistry(): PluginRegistry | null {
-  return activeRegistry;
+  return state.registry;
+}
+
+export function requireActivePluginRegistry(): PluginRegistry {
+  if (!state.registry) {
+    state.registry = createEmptyRegistry();
+  }
+  return state.registry;
 }
 
 export function getActivePluginRegistryKey(): string | null {
-  return activeRegistryKey;
+  return state.key;
 }