fix(hooks): decouple message:sent internal hook from mirror param

(cherry picked from commit 1afd7030f8)

src/infra/outbound/deliver.test.ts

@@ -478,7 +478,7 @@ describe("deliverOutboundPayloads", () => {
     expect(internalHookMocks.triggerInternalHook).toHaveBeenCalledTimes(1);
   });
 
-  it("does not emit internal message:sent hook when mirror sessionKey is missing", async () => {
+  it("does not emit internal message:sent hook when neither mirror nor sessionKey is provided", async () => {
     const sendWhatsApp = vi.fn().mockResolvedValue({ messageId: "w1", toJid: "jid" });
 
     await deliverOutboundPayloads({
@@ -493,6 +493,35 @@ describe("deliverOutboundPayloads", () => {
     expect(internalHookMocks.triggerInternalHook).not.toHaveBeenCalled();
   });
 
+  it("emits internal message:sent hook when sessionKey is provided without mirror", async () => {
+    const sendWhatsApp = vi.fn().mockResolvedValue({ messageId: "w1", toJid: "jid" });
+
+    await deliverOutboundPayloads({
+      cfg: whatsappChunkConfig,
+      channel: "whatsapp",
+      to: "+1555",
+      payloads: [{ text: "hello" }],
+      deps: { sendWhatsApp },
+      sessionKey: "agent:main:main",
+    });
+
+    expect(internalHookMocks.createInternalHookEvent).toHaveBeenCalledTimes(1);
+    expect(internalHookMocks.createInternalHookEvent).toHaveBeenCalledWith(
+      "message",
+      "sent",
+      "agent:main:main",
+      expect.objectContaining({
+        to: "+1555",
+        content: "hello",
+        success: true,
+        channelId: "whatsapp",
+        conversationId: "+1555",
+        messageId: "w1",
+      }),
+    );
+    expect(internalHookMocks.triggerInternalHook).toHaveBeenCalledTimes(1);
+  });
+
   it("calls failDelivery instead of ackDelivery on bestEffort partial failure", async () => {
     const sendWhatsApp = vi
       .fn()

src/infra/outbound/deliver.ts

@@ -216,6 +216,8 @@ type DeliverOutboundPayloadsCoreParams = {
     mediaUrls?: string[];
   };
   silent?: boolean;
+  /** Session key for internal hook dispatch (when `mirror` is not needed). */
+  sessionKey?: string;
 };
 
 type DeliverOutboundPayloadsParams = DeliverOutboundPayloadsCoreParams & {
@@ -444,7 +446,7 @@ async function deliverOutboundPayloadsCore(
     return normalized ? [normalized] : [];
   });
   const hookRunner = getGlobalHookRunner();
-  const sessionKeyForInternalHooks = params.mirror?.sessionKey;
+  const sessionKeyForInternalHooks = params.mirror?.sessionKey ?? params.sessionKey;
   for (const payload of normalizedPayloads) {
     const payloadSummary: NormalizedOutboundPayload = {
       text: payload.text ?? "",