Copy to clipboard broken over SSH (MobaXterm & Windows Terminal)

[b3nw]

When running OpenCode over SSH from Windows, the "Copy Message" feature (ctrl+x then y) displays "copied to clipboard" notification, but pasting on Windows does not work. The clipboard contains only the previous content.

This issue makes OpenCode unusable for SSH connections from Windows. Other CLI agents such as Claude Code and Gemini CLI do not block clipboard operations over SSH - they allow normal copy/paste functionality. OpenCode is the only agent with this clipboard limitation.

Steps to Reproduce

1. Connect from Windows to Debian host via SSH using MobaXterm
2. Run opencode
3. Open a session or continue an existing one
4. Press ctrl+x then y to copy a message
5. See "copied to clipboard" notification
6. Paste in Windows (ctrl+v or right-click) - contains old clipboard content only

Expected Behavior
Text should be copied to Windows clipboard and available for pasting

Actual Behavior
Clipboard shows "copied to clipboard" but pasting returns previous clipboard content (often just -`)

Environment

• OpenCode version: v1.0.132+ (TUI with opentui)
• Platform: Windows 11
• Terminal: MobaXterm (latest)
• SSH target: Debian Linux
• Connection: Windows → MobaXterm → SSH → Debian → opencode

Additional Testing

1. Same issue occurs with Windows Terminal instead of MobaXterm
2. Tested with OPENCODE_EXPERIMENTAL_DISABLE_COPY_ON_SELECT=1 - stops auto-copy-on-select but manual copy (ctrl+x then y) still fails
3. Without the env var, auto-copy shows same issue (clipboard contains -`)

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• clipboard copy not works in remote SSH console. #2773: clipboard copy not works in remote SSH console
• Copy To Clipboard is not working #4283: Copy To Clipboard is not working
• Can't copy text from opencode through mouse selection in Windows Terminal #5046: Can't copy text from opencode through mouse selection in Windows Terminal

These issues all describe similar clipboard functionality problems in various SSH and Windows environments. Feel free to ignore if your specific case differs from these.