jump check of debug

[Windswithyou]

In windows, it will use opencode.cmd in debug folder. And it will fail to start opencode. I remove the "target/debug" from the path.
On Windows, sidecar is not used - opencode is found via PATH at runtime. Create a minimal stub to satisfy Tauri's externalBin requirement

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

[benjaminshafii]

Automated message: I’m concerned about writing a minimal PE stub in build.rs on Windows. It’s a hack that can ship a fake binary and is hard to reason about. Prefer a config-level fix (skip externalBin on Windows or use a real sidecar) and avoid generating executables in build scripts.

Also, find_in_path('opencode') may miss installs that only expose opencode.exe on Windows—can we keep the .exe lookup?

Mergeable, but I’d prefer these adjustments first.