fix(regression): restore matrix cold-runtime chunking

extensions/matrix/runtime-api.ts

@@ -34,3 +34,4 @@ export type {
   WizardPrompter,
 } from "openclaw/plugin-sdk/matrix";
 export { formatZonedTimestamp } from "openclaw/plugin-sdk/matrix";
+export { chunkTextForOutbound } from "openclaw/plugin-sdk/matrix";

extensions/matrix/src/channel.ts

@@ -49,6 +49,7 @@ import {
 import {
   buildChannelConfigSchema,
   buildProbeChannelStatusSummary,
+  chunkTextForOutbound,
   collectStatusIssuesFromLastError,
   DEFAULT_ACCOUNT_ID,
   PAIRING_APPROVED_MESSAGE,
@@ -454,7 +455,7 @@ export const matrixPlugin: ChannelPlugin<ResolvedMatrixAccount, MatrixProbe> =
     },
     outbound: {
       deliveryMode: "direct",
-      chunker: (text, limit) => getMatrixRuntime().channel.text.chunkMarkdownText!(text, limit),
+      chunker: chunkTextForOutbound,
       chunkerMode: "markdown",
       textChunkLimit: 4000,
       ...createRuntimeOutboundDelegates({

extensions/matrix/src/outbound.test.ts

@@ -31,6 +31,16 @@ describe("matrixOutbound cfg threading", () => {
     mocks.sendPollMatrix.mockResolvedValue({ eventId: "$poll", roomId: "!room:example" });
   });
 
+  it("chunks outbound text without requiring Matrix runtime initialization", () => {
+    const chunker = matrixOutbound.chunker;
+    if (!chunker) {
+      throw new Error("matrixOutbound.chunker missing");
+    }
+
+    expect(() => chunker("hello world", 5)).not.toThrow();
+    expect(chunker("hello world", 5)).toEqual(["hello", "world"]);
+  });
+
   it("passes resolved cfg to sendMessageMatrix for text sends", async () => {
     const cfg = {
       channels: {

extensions/matrix/src/outbound.ts

@@ -1,10 +1,14 @@
 import { sendMessageMatrix, sendPollMatrix } from "./matrix/send.js";
-import { resolveOutboundSendDep, type ChannelOutboundAdapter } from "./runtime-api.js";
+import {
+  chunkTextForOutbound,
+  resolveOutboundSendDep,
+  type ChannelOutboundAdapter,
+} from "./runtime-api.js";
 import { getMatrixRuntime } from "./runtime.js";
 
 export const matrixOutbound: ChannelOutboundAdapter = {
   deliveryMode: "direct",
-  chunker: (text, limit) => getMatrixRuntime().channel.text.chunkMarkdownText(text, limit),
+  chunker: chunkTextForOutbound,
   chunkerMode: "markdown",
   textChunkLimit: 4000,
   sendText: async ({ cfg, to, text, deps, replyToId, threadId, accountId, audioAsVoice }) => {

src/plugin-sdk/matrix.ts

@@ -45,6 +45,7 @@ export {
 } from "../channels/plugins/config-helpers.js";
 export { buildChannelConfigSchema } from "../channels/plugins/config-schema.js";
 export { formatPairingApproveHint } from "../channels/plugins/helpers.js";
+export { chunkTextForOutbound } from "./text-chunking.js";
 export {
   buildSingleChannelSecretPromptState,
   addWildcardAllowFrom,