feat: implement durable authenticated chat run coordinator

tests/unit/test_chat_runs_limits.py

@@ -0,0 +1,33 @@
+"""Offline storage-limit stop intent regression."""
+import asyncio
+from control.accounts import Accounts, token_hash
+from control.chat_store import ChatStore
+from control.chat_runs import ChatRuns
+
+def test_event_capacity_failure_persists_stop_and_reserved_terminal(tmp_path):
+    async def scenario():
+        accounts = Accounts(str(tmp_path/'limit.db'))
+        owner = accounts.create('test','Test','admin','offline-test-password')
+        store = ChatStore(accounts)
+        cid = store.create_conversation(owner['id'])['id']
+        rid = store.send(owner['id'],cid,'Hi','key')['run']['id']
+        store.update_run(owner['id'],rid,'running')
+        runs = ChatRuns(accounts,store,adapter=object())
+        runs.metadata(owner['id'],rid,{'conversation_id':cid,'payload':{},'upstream_id':'upstream','assistant_id':None})
+        original = store.append_event
+        def limited(owner,rid,event,data):
+            if event == 'progress':
+                raise ValueError('storage limit')
+            return original(owner,rid,event,data)
+        store.append_event = limited
+        try:
+            await runs.emit(owner['id'],rid,'progress',{'status':'working'})
+        except ValueError:
+            pass
+        metadata = runs.metadata(owner['id'],rid)
+        assert metadata['stop_requested'] and metadata['storage_failed']
+        assert await runs.consume_status(owner['id'],rid,metadata,{'status':'cancelled'})
+        assert store.get_run(owner['id'],rid)['run']['status'] == 'failed'
+        assert store.events(owner['id'],rid)[-1]['event'] == 'done'
+        accounts.close()
+    asyncio.run(scenario())