tui: resize listeners leak - repeated EventEmitter memory leak warnings on terminal resize #44055

Summary

The TUI emits repeated Possible EventEmitter memory leak detected warnings for terminal resize listeners during normal use. Listener count keeps growing across resizes/tab switches instead of being cleaned up, so long-running sessions accumulate leaked listeners.

Environment

• opencode version: 0.0.0-beta-17498 (@opencode-ai/cli@next)
• OS: Linux 7.0.0-30-generic (x64)
• Terminal: Ghostty (TERM_PROGRAM=ghostty, COLORTERM=truecolor)
• Shell: zsh
• Install/channel: beta (npm next tag)
• Active plugins: ~/.config/opencode/plugins/herdr-agent-state.js, ~/.config/opencode/plugins/moshi-hooks.ts

Reproduction

1. Start the v2 TUI in Ghostty.
2. Use it normally: switch tabs/sessions, resize the terminal window a few times, let agents run.
3. Observe stderr/log output over time.

Expected Behavior

Resize listeners added by the renderer are removed when the render root/tab is torn down, or the emitter uses setMaxListeners; no warnings appear.

Actual Behavior

Repeated warnings, timestamped across a session:

[WARN] 'Possible EventEmitter memory leak detected. 11 resize listeners added to [Si]. MaxListeners is 10. Use emitter.setMaxListeners() to increase limit'

The [Si] target is a minified internal class (terminal/viewport object). Count stays pinned at "11" per burst but the warning re-fires continuously, suggesting listeners are added on every layout pass without removing previous ones.

Also seen once alongside it:

[WARN] 'Anchor is the same as the node box-29847 being inserted, skipping insertBefore'

Additional Context

• Happens intermittently but reproducibly; correlates with window resizes and tab activity (timestamps line up with resize moments).
• Warnings are non-fatal but grow noise in logs and indicate unbounded listener accumulation in long sessions.
• Possibly related: MaxListenersExceededWarning after web interface starts #28492 (MaxListenersExceededWarning after web interface starts) — different surface, same class of leak.