refactor: route channel runtime via plugin api

src/plugin-sdk/index.test.ts

@@ -0,0 +1,51 @@
+import { describe, expect, it } from "vitest";
+
+import * as sdk from "./index.js";
+
+describe("plugin-sdk exports", () => {
+  it("does not expose runtime modules", () => {
+    const forbidden = [
+      "chunkMarkdownText",
+      "chunkText",
+      "resolveTextChunkLimit",
+      "hasControlCommand",
+      "isControlCommandMessage",
+      "shouldComputeCommandAuthorized",
+      "shouldHandleTextCommands",
+      "buildMentionRegexes",
+      "matchesMentionPatterns",
+      "resolveStateDir",
+      "loadConfig",
+      "writeConfigFile",
+      "runCommandWithTimeout",
+      "enqueueSystemEvent",
+      "detectMime",
+      "fetchRemoteMedia",
+      "saveMediaBuffer",
+      "formatAgentEnvelope",
+      "buildPairingReply",
+      "resolveAgentRoute",
+      "dispatchReplyFromConfig",
+      "createReplyDispatcherWithTyping",
+      "dispatchReplyWithBufferedBlockDispatcher",
+      "resolveCommandAuthorizedFromAuthorizers",
+      "monitorSlackProvider",
+      "monitorTelegramProvider",
+      "monitorIMessageProvider",
+      "monitorSignalProvider",
+      "sendMessageSlack",
+      "sendMessageTelegram",
+      "sendMessageIMessage",
+      "sendMessageSignal",
+      "sendMessageWhatsApp",
+      "probeSlack",
+      "probeTelegram",
+      "probeIMessage",
+      "probeSignal",
+    ];
+
+    for (const key of forbidden) {
+      expect(Object.prototype.hasOwnProperty.call(sdk, key)).toBe(false);
+    }
+  });
+});