Send the invitation as a light letter that names the community, the inviter by email, and who can read the Rule.

tests/unit/rulesStakeholderMutationsRoute.test.ts

@@ -130,7 +130,13 @@ describe("POST /api/rules/[id]/stakeholders", () => {
       routeCtx,
     );
     expect(res.status).toBe(201);
-    expect(createInviteMock).toHaveBeenCalled();
+    expect(createInviteMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        email: "inv@example.com",
+        ruleTitle: "My rule",
+        inviterEmail: owner.email,
+      }),
+    );
     const body = (await res.json()) as {
       stakeholder: { email: string; status: string };
     };
@@ -214,9 +220,14 @@ describe("POST /api/rules/[id]/stakeholders/[stakeholderId]/resend", () => {
     expect(await res.json()).toEqual({ ok: true });
     expect(updateMock).toHaveBeenCalled();
     expect(sendInviteEmailMock).toHaveBeenCalledWith(
-      "inv@example.com",
-      expect.stringContaining("/api/invites/rule-stakeholder/verify?token="),
-      "My rule",
+      expect.objectContaining({
+        to: "inv@example.com",
+        communityName: "My rule",
+        inviterEmail: owner.email,
+        verifyUrl: expect.stringContaining(
+          "/api/invites/rule-stakeholder/verify?token=",
+        ),
+      }),
     );
   });
 });