CLI observability gap: /tasks reports no subagents while inline Code-review agent is visibly running

[dorothyscheng]

In Copilot CLI 1.0.65, /tasks can report No subagents even while the timeline clearly shows an active inline Code-review(gpt-5.5) execution doing work.

Observed example:

• Timeline shows Code-review(gpt-5.5) Review fallback implementation
• It is actively reading files/searching
• /tasks panel shows:
  • Subagents: No subagents
  • Shell Commands: No shell commands

This makes it hard to tell whether the agent is stalled, still making progress, or cancellable. It would help if /tasks included inline agent executions too, or if the timeline exposed heartbeat/status/last-output timestamps for active subagents.