fix(whatsapp): use conversation id for context isolation (#911)

Thanks @tristanmanchester.

Co-authored-by: Tristan Manchester <tmanchester96@gmail.com>

src/auto-reply/reply/agent-runner-utils.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "vitest";
+
+import type { ClawdbotConfig } from "../../config/config.js";
+import type { TemplateContext } from "../templating.js";
+import { buildThreadingToolContext } from "./agent-runner-utils.js";
+
+describe("buildThreadingToolContext", () => {
+  const cfg = {} as ClawdbotConfig;
+
+  it("uses conversation id for WhatsApp", () => {
+    const sessionCtx = {
+      Provider: "whatsapp",
+      From: "123@g.us",
+      To: "+15550001",
+    } as TemplateContext;
+
+    const result = buildThreadingToolContext({
+      sessionCtx,
+      config: cfg,
+      hasRepliedRef: undefined,
+    });
+
+    expect(result.currentChannelId).toBe("123@g.us");
+  });
+
+  it("uses the recipient id for other channels", () => {
+    const sessionCtx = {
+      Provider: "telegram",
+      From: "user:42",
+      To: "chat:99",
+    } as TemplateContext;
+
+    const result = buildThreadingToolContext({
+      sessionCtx,
+      config: cfg,
+      hasRepliedRef: undefined,
+    });
+
+    expect(result.currentChannelId).toBe("chat:99");
+  });
+});