Fix QQBot reconnect lifecycle after transient websocket disconnects

[yiantong35]

PR: Fix QQBot reconnect lifecycle after transient websocket disconnects

Branch prepared locally:

/tmp/hermes-agent-qqbot-pr
fix/qqbot-reconnect-lifecycle

Commit:

4ddf217a8 Fix QQBot reconnect lifecycle

Fork remote:

https://github.com/yiantong35/hermes-agent.git

Title

Fix QQBot reconnect lifecycle after transient websocket disconnects

Body

## Summary

Fixes QQBot reconnect lifecycle handling after transient WebSocket disconnects.

Previously the QQBot adapter called `_mark_disconnected()` for temporary gateway
socket closes/errors. That updates the adapter lifecycle state used by listener
and heartbeat logic, so a transient disconnect could leave the adapter in a
partially reconnected state without a healthy heartbeat task.

This change:

- adds `QQAdapter.is_connected` based on the active WebSocket state
- records transient disconnect status without stopping the adapter lifecycle
- restarts the heartbeat loop after successful reconnect if the previous task finished
- preserves WebSocket close code/reason for `CLOSED` / `ERROR` messages
- closes an unawaited coroutine when no event loop is available
- adds regression tests for reconnect lifecycle behavior

## Test

```bash
/home/tangyujie/.hermes/hermes-agent/venv/bin/python -m pytest tests/gateway/test_qqbot.py -q -n 0

Result:

74 passed in 3.24s

## Push Commands

Run from the prepared worktree after authenticating with GitHub:

```bash
cd /tmp/hermes-agent-qqbot-pr
git push yiantong35 fix/qqbot-reconnect-lifecycle

Then create the PR:

base repository: NousResearch/hermes-agent
base branch: main
head repository: yiantong35/hermes-agent
compare branch: fix/qqbot-reconnect-lifecycle

Direct compare URL after push:

https://github.com/NousResearch/hermes-agent/compare/main...yiantong35:hermes-agent:fix/qqbot-reconnect-lifecycle

Current Blocker

The code, branch, commit, and tests are ready. Push is blocked only by GitHub
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Do not paste a GitHub token into chat. Authenticate locally with GitHub CLI,
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[alt-glitch]

Related: #24357 (heartbeat lost after reconnect — same symptom), #19414 (superset 5-bug reconnect fix — overlapping scope), #17703 (reconnect stops after failed reconnect). This PR addresses the lifecycle state confusion that causes heartbeat loss.

[teknium1]

Thanks for the careful reconnect analysis. This automated hermes-sweeper review found that the lifecycle guarantee is already implemented on current main.

• Commit 8199ec380 (fix(gateway): keep QQBot reconnect loop alive), included in v2026.5.16, introduced gateway/platforms/qqbot/adapter.py:178 _mark_transport_disconnected() specifically to preserve _running during transient transport drops.
• Current gateway/platforms/qqbot/adapter.py:546 and :651 use that helper for both close and generic WebSocket-error paths, so _listen_loop continues into reconnect instead of being stopped by _mark_disconnected().
• The existing heartbeat loop remains active while _running is true (gateway/platforms/qqbot/adapter.py:720-728) and skips closed sockets during the reconnect window.

The member's related-heartbeat discussion maps to the same symptom, but the requested lifecycle behavior is now present on main.