Set host terminal title for agent sessions and dashboard

[madarco]

Summary

• The host terminal/tab title (iTerm2 etc.) was never set when running agentbox claude/codex/opencode/attach or dashboard. The inner agent's OSC title is swallowed by tmux (set-titles off) and by @xterm/headless in the dashboard, so it never reaches the host.
• New TTY-guarded helper apps/cli/src/terminal/title.ts: OSC 0 set-title plus XTPUSHTITLE/XTPOPTITLE to save/restore the user's original title.
• Attach paths (docker + cloud, one runWrappedAttach site) now show just <title> — the live session title from status.json, resolved per active agent so codex/opencode work too, falling back to the box name until the agent sets one.
• Dashboard shows AgentBox: <selected box title|name>, updated on box switch and restored on exit.
• Drives the title from the already-polled status (uniform across docker/daytona/hetzner); ~3s update latency. No new dependency, no tmux set-titles change (host stays the sole title writer).

Test plan

• pnpm build, pnpm typecheck, pnpm lint clean
• pnpm test (335 passed, incl. new terminal-title.test.ts)
• Ran compiled dashboard under a real PTY: emits \x1b[22;2t (push), \x1b]0;AgentBox\x07 (title), \x1b[23;2t (pop on quit)
• Manual on host in iTerm2: agentbox claude tab shows box name then the agent's session title, restored on exit
• Manual on host: agentbox dashboard tab shows AgentBox: <selected>, updates on Ctrl+Option+↑/↓, restored on quit

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Note

Low Risk
Terminal UX only (OSC sequences, title sanitization); no auth, data, or infrastructure changes beyond existing status polling.

Overview
Adds a TTY-safe terminal/title helper (OSC 0 set-title, push/pop title stack) so the host tab/window title updates even when tmux or the dashboard headless PTY swallow inner OSC sequences.

Attach (runWrappedAttach): saves the user’s title, seeds the tab with the box name, then mirrors the live session title from polled status.json for Claude/Codex/OpenCode (not shell), with deduped writes; restores the prior title on exit.

Dashboard: on entry pushes the saved title and sets AgentBox: <session title|box name> (or AgentBox for “+ New box”), refreshed when selection/chrome redraws; restores on quit. stripTitleGlyph is exported for shared title cleanup.

Includes terminal-title.test.ts for OSC/CSI output and sanitization.

^{Reviewed by Cursor Bugbot for commit 940844e. Configure here.}