good-saltfish/dsh-multi-session

Multi-session overview: list every session grouped by workspace with live status, and pin up to three side by side to read their conversation text. Each card says whether a session finished since you last looked, is waiting on your answer, or has stalled mid-turn, and which files it changed. Send a message or interrupt any session without switching away, with a receipt showing whether it was queued, delivered or being processed. Search across all sessions, forward a turn to another, and switch a session's model from its card.