fix(regression): restore signal cold-runtime chunking

extensions/signal/src/channel.ts

@@ -18,6 +18,7 @@ import { resolveSignalOutboundTarget } from "./outbound-session.js";
 import { probeSignal, type SignalProbe } from "./probe.js";
 import {
   buildBaseChannelStatusSummary,
+  chunkText,
   collectStatusIssuesFromLastError,
   createDefaultChannelRuntimeState,
   DEFAULT_ACCOUNT_ID,
@@ -306,7 +307,7 @@ export const signalPlugin: ChannelPlugin<ResolvedSignalAccount, SignalProbe> =
     outbound: {
       base: {
         deliveryMode: "direct",
-        chunker: (text, limit) => getSignalRuntime().channel.text.chunkText(text, limit),
+        chunker: chunkText,
         chunkerMode: "text",
         textChunkLimit: 4000,
         sendFormattedText: async ({ cfg, to, text, accountId, deps, abortSignal }) =>

extensions/signal/src/core.test.ts

@@ -131,6 +131,18 @@ describe("probeSignal", () => {
   });
 });
 
+describe("signal outbound", () => {
+  it("chunks outbound text without requiring Signal runtime initialization", () => {
+    clearSignalRuntime();
+    const chunker = signalPlugin.outbound?.chunker;
+    if (!chunker) {
+      throw new Error("signal outbound.chunker unavailable");
+    }
+
+    expect(chunker("alpha beta", 5)).toEqual(["alpha", "beta"]);
+  });
+});
+
 describe("classifySignalCliLogLine", () => {
   it("treats INFO/DEBUG as log", () => {
     expect(classifySignalCliLogLine("INFO  DaemonCommand - Started")).toBe("log");

src/plugin-sdk/signal.ts

@@ -51,6 +51,7 @@ export { SignalConfigSchema } from "../config/zod-schema.providers-core.js";
 
 export { normalizeE164 } from "../utils.js";
 export { resolveChannelMediaMaxBytes } from "../channels/plugins/media-limits.js";
+export { chunkText } from "../auto-reply/chunk.js";
 export {
   createCliPathTextInput,
   createDelegatedTextInputShouldPrompt,