fix: reconcile uncertain voice admission with bounded cancellation

tests/unit/test_conversation_llm.py

@@ -174,6 +174,31 @@ class ConversationLLMTests(unittest.IsolatedAsyncioTestCase):
             await asyncio.gather(consumer, return_exceptions=True)
             await bridge.aclose()
 
+    async def test_normal_lost_admission_receipt_persists_key_cancellation(self):
+        requests, progress_events = [], []
+        async def handler(request):
+            requests.append(request.url.path)
+            if request.url.path.endswith('/messages'):
+                raise httpx.ReadError('Offline accepted admission receipt lost', request=request)
+            if '/operations/' in request.url.path and request.url.path.endswith('/cancel'):
+                return httpx.Response(200, json={'ok': True})
+            self.fail('Unknown admission identity must not stream or invent a run stop')
+        async def progress(value): progress_events.append(value)
+        bridge = ConversationLLM(control_url='https://offline.test', secret='offline', room_id='bound-room', on_progress=progress)
+        await bridge.client.aclose()
+        bridge.client = httpx.AsyncClient(transport=httpx.MockTransport(handler))
+        context = llm.ChatContext([llm.ChatMessage(role='user', content=['Lost receipt without barge-in'])])
+        try:
+            with self.assertRaises(Exception):
+                async with bridge.chat(chat_ctx=context) as stream:
+                    async for _ in stream:
+                        self.fail('No answer is safe after uncertain admission failure')
+            self.assertEqual(requests, ['/internal/chat/rooms/bound-room/messages',
+                '/internal/chat/rooms/bound-room/operations/' + context.items[-1].id + '/cancel'])
+            self.assertEqual(progress_events[-1]['status'], 'failed')
+        finally:
+            await bridge.aclose()
+
     async def test_key_cancel_receipt_prevents_late_rejected_admission_action(self):
         entered, release, tombstoned = asyncio.Event(), asyncio.Event(), asyncio.Event()
         requests, progress_events = [], []