chore(test): harden channel plugin registry against malformed runtime state

src/channels/plugins/registry.test.ts

@@ -0,0 +1,24 @@
+import { afterEach, describe, expect, it } from "vitest";
+import { createEmptyPluginRegistry } from "../../plugins/registry-empty.js";
+import type { PluginRegistry } from "../../plugins/registry.js";
+import { resetPluginRuntimeStateForTest, setActivePluginRegistry } from "../../plugins/runtime.js";
+import { listChannelPlugins } from "./registry.js";
+
+function withMalformedChannels(registry: PluginRegistry): PluginRegistry {
+  const malformed = { ...registry } as PluginRegistry;
+  (malformed as { channels?: unknown }).channels = undefined;
+  return malformed;
+}
+
+afterEach(() => {
+  resetPluginRuntimeStateForTest();
+});
+
+describe("listChannelPlugins", () => {
+  it("returns an empty list when runtime registry has no channels field", () => {
+    const malformedRegistry = withMalformedChannels(createEmptyPluginRegistry());
+    setActivePluginRegistry(malformedRegistry);
+
+    expect(listChannelPlugins()).toEqual([]);
+  });
+});

src/channels/plugins/registry.ts

@@ -41,7 +41,16 @@ function resolveCachedChannelPlugins(): CachedChannelPlugins {
     return cached;
   }
 
-  const sorted = dedupeChannels(registry.channels.map((entry) => entry.plugin)).toSorted((a, b) => {
+  const channelPlugins: ChannelPlugin[] = [];
+  if (Array.isArray(registry.channels)) {
+    for (const entry of registry.channels) {
+      if (entry?.plugin) {
+        channelPlugins.push(entry.plugin);
+      }
+    }
+  }
+
+  const sorted = dedupeChannels(channelPlugins).toSorted((a, b) => {
     const indexA = CHAT_CHANNEL_ORDER.indexOf(a.id as ChatChannelId);
     const indexB = CHAT_CHANNEL_ORDER.indexOf(b.id as ChatChannelId);
     const orderA = a.meta.order ?? (indexA === -1 ? 999 : indexA);