[Feature] Unified inter-agent status view without window-switching

Problem

When running multiple sub-agents in parallel (typically across tmux windows), the only way to see what each agent is doing is to manually switch windows. There is no way to get a summary of all active agents' state from the orchestrating session.

This makes multi-agent coordination expensive — the orchestrator loses flow state on every window switch, and there's no way to detect when an agent is stuck, waiting, or done without checking each one individually.

Proposed Solution

A status command that shows a live or on-demand summary of all active agents:

/agents

Output example:

Agent         Task                          Status       Last Action
─────────────────────────────────────────────────────────────────────
agent-1       Fix #42 auth bug              ✓ Done       Committed changes
agent-2       Implement #47 dashboard       ⏳ Running   Writing tests
agent-3       Refactor #51 data layer       ⚠ Waiting    Asked for clarification

Minimum viable version: a /agents command that reads tmux pane titles/output and returns a summary without requiring the user to switch windows.

Use Case

"I have 4 agents running. Without leaving my current session, tell me which ones are done, which are blocked, and which need my input."

Related

• Connects to the agent-inspector skill which provides some of this via tmux inspection
• Would pair naturally with batch orchestration (separate issue)