v0.8.7: interactive mailbox, managed bots

A more interactive mailbox, managed bots, and clean-slate restarts.

📬 The mailbox is interactive now. Scroll it, filter and search messages by sender or text, and open any message in a detail view with its full body and a relative timestamp.

🤖 Set up one bot, teamctl generates the rest. Point teamctl bot setup at a single manager bot and it spins up a child bot per manager for you; you confirm one t.me link each, no separate BotFather trip per agent. The manual flow stays as the other option.

♻️ --fresh restarts into a clean session. teamctl reload --fresh and up --fresh bring an agent up in a brand-new Claude conversation while keeping durable files on disk.