Implements detailed polecat status display including: - Lifecycle state (working, done, stuck, idle) - Assigned issue - Session status (running/stopped, attached/detached) - Session creation time - Last activity time with relative "ago" format Also extends tmux.SessionInfo and session.Info to include last activity timestamp from tmux session_activity. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>