When a member comments on an issue assigned to an agent, automatically
enqueue a new task if the agent has on_comment trigger enabled (or no
triggers configured). Combined with session persistence, the agent
resumes its prior conversation context and sees the new feedback.
- Add HasActiveTaskForIssue query to prevent duplicate task enqueue
- Refactor shouldEnqueueAgentTask into reusable isAgentTriggerEnabled
- Add shouldEnqueueOnComment with active-task and status guards
- Call trigger logic from CreateComment handler