VS Code extension still not auto-installed on Windows despite TERM_PROGRAM=vscode (recurrence of #36404)

Description

The VS Code extension (sst-dev.opencode) is not automatically installed when running opencode from the VS Code integrated terminal, even though all documented prerequisites are met. Manual installation via the code CLI works fine.

This is a recurrence of #36404, which was auto-closed after 60 days of inactivity without a fix. Still reproducible on the latest version.

Environment

• OS: Windows 11
• OpenCode: 1.18.31
• Shell: PowerShell 7 (pwsh)
• VS Code integrated terminal

Verified

• TERM_PROGRAM is set to vscode:

  PS> echo $env:TERM_PROGRAM
  vscode
  

• VS Code CLI is on PATH and works (code --install-extension ... succeeds)
• code --list-extensions shows no extensions before manual install — opencode never attempts to install the extension
• Running opencode launches the TUI normally but skips extension installation entirely
• Manual install succeeds:

  PS> code --install-extension sst-dev.opencode
  Extension 'sst-dev.opencode' v0.0.13 was successfully installed.
  

Investigation (from #36404)

packages/opencode/src/ide/index.ts defines ide(), install() and alreadyInstalled(), but Ide.install is never referenced anywhere in packages — only alreadyInstalled() is referenced in its unit tests. The auto-install path appears to be dead code.

OpenCode version

1.18.31

Steps to reproduce

1. Open VS Code on Windows
2. Open the integrated terminal (pwsh 7)
3. Confirm echo $env:TERM_PROGRAM prints vscode
4. Run opencode
5. Run code --list-extensions — sst-dev.opencode is not installed

Operating System

Windows 11

Terminal

VS Code integrated terminal (pwsh 7)