Every chat that got a reply left a small lock behind in the server process, so a long-running server kept one for every chat it had ever answered and only a restart gave the memory back. The lock is now dropped as soon as nothing is using it, so a finished reply leaves nothing behind per chat, while replies, sub-agent results and timers for the same chat still wait for each other as before.
Fixes#31521
In a chat inside a folder with knowledge attached, the chat only searches the folder's knowledge, but a sub-agent it started could list and search every knowledge base the user can read. Sub-agents now get the folder's knowledge like the chat that started them. They already receive the folder's system prompt as part of the chat's instructions, so it is not added a second time.
Fixes#31569
When a background sub-agent finished while the model was still writing the answer that started it, the sub-agent's report was placed as a reply to the previous answer instead. Once the answer ended, the chat switched to that other branch of the conversation, which hid the latest question and answer, and the model replied to the report without seeing that question and answer. The report now follows the answer that started the sub-agent (or the newest completed reply after it), so the conversation stays on one branch.
Fixes#31507
When a sub-agent running in the background finished, or a timer the model set went off, the result and the model's follow-up reply were saved but did not show in the chat the user had open. They only appeared after a manual page reload. They now show in the open chat as soon as they arrive.
Fixes#31566
