chore: fix retry when quality check failed

[fengju0213]

Description

Root cause:
Quality-check recovery cleaned up task tracking (including _assignees) before
retrying. The retry path posted the task again but did not restore the _assignees
mapping, so subsequent quality checks could not find the assignee and logged “No
assignee found in _assignees”.

Fix:
Update _post_task to always set self._assignees[task.id] = assignee_id whenever a
task is posted. This guarantees assignee mapping is restored on retries (and any
other reposts), preventing failures in the quality-check recovery flow.

Checklist

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• I have updated the tests accordingly (required for a bug fix or a new feature)
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[a7m-1st]

I haven't had the chance to look at the edge cases, but ya i get whats happening, the task is perhaps added to the failed queue and thus the dictionary remained clear of the task. Thus retry can't find it 👍