feat(automation): add isolated job delivery mode

src/channels/registry.test.ts

@@ -132,6 +132,29 @@ describe('ChannelRegistry', () => {
     expect(adapter.sendFn).toHaveBeenCalledWith('user-42', { text: 'pong' });
   });
 
+  it('routes reply using metadata.replyPeerId when provided', async () => {
+    const adapter = createMockAdapter('test-channel');
+    registry.register(adapter);
+
+    const handler = vi.fn(async (_msg: InboundMessage, reply: (r: OutboundMessage) => Promise<void>) => {
+      await reply({ text: 'pong' });
+    });
+    registry.setMessageHandler(handler);
+
+    const msg = {
+      ...makeMessage('test-channel'),
+      senderId: 'isolated-run-1',
+      metadata: { replyPeerId: 'job-a' },
+    };
+    adapter.triggerMessage(msg);
+
+    await vi.waitFor(() => {
+      expect(handler).toHaveBeenCalledOnce();
+    });
+
+    expect(adapter.sendFn).toHaveBeenCalledWith('job-a', { text: 'pong' });
+  });
+
   it('unregisters adapter', () => {
     const adapter = createMockAdapter('removeme');
     registry.register(adapter);

src/channels/registry.ts

@@ -105,7 +105,11 @@ export class ChannelRegistry {
 
     // Create a reply function bound to this message's channel and sender
     const reply = async (response: OutboundMessage): Promise<void> => {
-      await adapter.send(msg.senderId, response);
+      const metadata = msg.metadata as Record<string, unknown> | undefined;
+      const replyPeerId = typeof metadata?.replyPeerId === 'string' && metadata.replyPeerId.length > 0
+        ? metadata.replyPeerId
+        : msg.senderId;
+      await adapter.send(replyPeerId, response);
     };
 
     // Fire and forget — errors are logged, not propagated