feat: add session origin metadata helpers

src/config/sessions/metadata.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, it } from "vitest";
+
+import { deriveSessionMetaPatch } from "./metadata.js";
+
+describe("deriveSessionMetaPatch", () => {
+  it("captures origin + group metadata", () => {
+    const patch = deriveSessionMetaPatch({
+      ctx: {
+        Provider: "whatsapp",
+        ChatType: "group",
+        GroupSubject: "Family",
+        From: "123@g.us",
+      },
+      sessionKey: "agent:main:whatsapp:group:123@g.us",
+    });
+
+    expect(patch?.origin?.label).toBe("Family id:123@g.us");
+    expect(patch?.origin?.provider).toBe("whatsapp");
+    expect(patch?.subject).toBe("Family");
+    expect(patch?.channel).toBe("whatsapp");
+    expect(patch?.groupId).toBe("123@g.us");
+  });
+});