feature/reply-to-chat-or-task

[zfoong]

What and Why:
You can now reply directly to a certain agent message or task. This gives more context to the agent on what you are referring to. Also, it can directly route to the correct task session without the route to session call, which wastes tokens and can be inaccurate.

Items changes/features added

• Reply to Chat: click reply icon on agent messages to reply directly
• Reply to Task: click reply icon on running/waiting tasks
• Direct session routing bypasses LLM when replying to active tasks
• Reply context displayed in callout above user message
• Database migration for task_session_id persistence

Behaviour:

• Reply to active/waiting task → Direct bypass works, routes to that task
• Agent will first try to fire the trigger for that session
• If the session is expired/not found, it falls through to normal routing (conversation mode)
• The routing LLM will decide whether to route to an active task or create a new one