Terminal tab not renamed to opencode when launched manually in VS Code integrated terminal, breaking Cmd+Option+K file reference hotkey #27678

Description

When running opencode manually in VS Code's integrated terminal (typing opencode directly, not via the extension's Cmd+Esc launcher), the terminal tab stays named "zsh" instead of being renamed to "opencode". This prevents the Cmd+Option+K file reference hotkey from working because the extension identifies opencode terminals by checking terminal.name === "opencode" (see sdks/vscode/src/extension.ts:35).

Root cause

The bin/opencode entry point is a Node.js wrapper (#!/usr/bin/env node) that uses child_process.spawn() to launch the compiled opencode binary as a child process, keeping the node wrapper alive as a signal forwarder:

zsh → node (wrapper) → opencode (compiled binary)

VS Code's terminal process detection reads the binary filename from the OS process table (via ps/kern_proc). It sees the direct child of zsh as node, not opencode. Since the compiled binary is a grandchild, VS Code never detects it.

This is the same underlying issue as #10993 — Cmd+Option+K fails because the extension checks terminal.name === TERMINAL_NAME and the name never becomes "opencode".

Proposed fix

Replace the Node.js wrapper with a POSIX shell script that execs directly into the compiled binary. On Unix, exec replaces the calling process with the target binary, so the OS process table shows opencode as the direct child of zsh:

zsh → opencode (compiled binary, via exec)

The change is:

1. bin/opencode becomes a ~25-line POSIX shell script that resolves the binary path and execs into it
2. bin/opencode-resolve (new) — the existing Node.js detection logic (platform/AVX2/musl), outputs the resolved binary path to stdout instead of spawning+forwarding signals
3. bin/opencode.cmd (new) — Windows fallback using the Node.js resolver

I have this working locally — confirmed that running the compiled binary directly renames the VS Code terminal tab to "opencode", and Cmd+Option+K works as expected.

Plugins

Official OpenCode Extension

Steps to reproduce

1. Open VS Code integrated terminal (Ctrl+`)
2. Type opencode (do NOT use Cmd+Esc)
3. Observe terminal tab stays "zsh"
4. Open a file, highlight a line, press Cmd+Option+K
5. Nothing happens — file reference is not sent to the terminal

Operating System

macOS 26.2

Terminal

VS Code Integrated Terminal