Add MulmoTerminal to Clients & GUIs

[isamu]

Adds MulmoTerminal — a browser grid for running many coding-agent sessions side by side.

- [MulmoTerminal](https://github.com/receptron/mulmoterminal) - Browser grid of live Claude Code /
  Codex sessions started with one `npx` command. Each cell is a real PTY with a colour-coded
  status, tmux-backed persistence, and a git worktree per cell. For Claude Code, needs-you is
  shown separately from done, read from the CLI's own hooks.

Session state comes from the agent CLI's own hooks (PreToolUse / Stop / Notification), not from parsing scrollback, so a Claude Code session blocked on a permission prompt is a different colour from one still working. Codex does not report blocked-on-input — its approval prompt is drawn in the TUI and never reaches the rollout file — so for Codex the grid shows working / done only.

MIT, Node 22.9+, runs locally with npx mulmoterminal@latest.

Disclosure: I am one of the authors.