refactor: unify markdown formatting pipeline

src/infra/outbound/deliver.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it, vi } from "vitest";
 
 import type { ClawdbotConfig } from "../../config/config.js";
+import { markdownToSignalTextChunks } from "../../signal/format.js";
 import { deliverOutboundPayloads, normalizeOutboundPayloads } from "./deliver.js";
 
 describe("deliverOutboundPayloads", () => {
@@ -22,7 +23,9 @@ describe("deliverOutboundPayloads", () => {
 
       expect(sendTelegram).toHaveBeenCalledTimes(2);
       for (const call of sendTelegram.mock.calls) {
-        expect(call[2]).toEqual(expect.objectContaining({ accountId: undefined, verbose: false }));
+        expect(call[2]).toEqual(
+          expect.objectContaining({ accountId: undefined, verbose: false, textMode: "html" }),
+        );
       }
       expect(results).toHaveLength(2);
       expect(results[0]).toMatchObject({ channel: "telegram", chatId: "c1" });
@@ -53,7 +56,7 @@ describe("deliverOutboundPayloads", () => {
     expect(sendTelegram).toHaveBeenCalledWith(
       "123",
       "hi",
-      expect.objectContaining({ accountId: "default", verbose: false }),
+      expect.objectContaining({ accountId: "default", verbose: false, textMode: "html" }),
     );
   });
 
@@ -75,11 +78,46 @@ describe("deliverOutboundPayloads", () => {
       expect.objectContaining({
         mediaUrl: "https://x.test/a.jpg",
         maxBytes: 2 * 1024 * 1024,
+        textMode: "plain",
+        textStyles: [],
       }),
     );
     expect(results[0]).toMatchObject({ channel: "signal", messageId: "s1" });
   });
 
+  it("chunks Signal markdown using the format-first chunker", async () => {
+    const sendSignal = vi
+      .fn()
+      .mockResolvedValue({ messageId: "s1", timestamp: 123 });
+    const cfg: ClawdbotConfig = {
+      channels: { signal: { textChunkLimit: 20 } },
+    };
+    const text = `Intro\\n\\n\`\`\`\`md\\n${"y".repeat(60)}\\n\`\`\`\\n\\nOutro`;
+    const expectedChunks = markdownToSignalTextChunks(text, 20);
+
+    await deliverOutboundPayloads({
+      cfg,
+      channel: "signal",
+      to: "+1555",
+      payloads: [{ text }],
+      deps: { sendSignal },
+    });
+
+    expect(sendSignal).toHaveBeenCalledTimes(expectedChunks.length);
+    expectedChunks.forEach((chunk, index) => {
+      expect(sendSignal).toHaveBeenNthCalledWith(
+        index + 1,
+        "+1555",
+        chunk.text,
+        expect.objectContaining({
+          accountId: undefined,
+          textMode: "plain",
+          textStyles: chunk.styles,
+        }),
+      );
+    });
+  });
+
   it("chunks WhatsApp text and returns all results", async () => {
     const sendWhatsApp = vi
       .fn()