Feature request: real-time view of active sessions

Feature Request

Is your feature request related to a problem?

Currently there's no way to see which Claude Code sessions are actively running in real-time. /resume shows historical sessions but doesn't distinguish between sessions that are currently executing vs. idle/closed. If I have multiple terminal windows open, I can't tell from within Claude Code which other sessions are still active.

Describe the solution you'd like

A command (e.g. /sessions or claude --list-active) that shows all currently running Claude Code sessions in real-time, including:

• Session name / initial prompt
• Status (running / idle / waiting for input)
• Which directory / project each session is in
• How long it's been running

Describe alternatives you've considered

• Using OS-level process inspection (tasklist, ps) — but this only shows processes, not session-level details.
• /resume — shows history but not live status.

Additional context

This would be especially useful for users who run multiple sessions in parallel (e.g. with --worktree) and want a quick overview of what's going on.