Windows: _ensure-sidecar-stubs Justfile recipe omits the .exe suffix Tauri requires for externalBin #2492

Description

The _ensure-sidecar-stubs recipe in the root Justfile creates sidecar
placeholder files as:

TARGET=$(rustc -vV | sed -n 's|host: ||p')
for bin in buzz-acp buzz-agent buzz-dev-mcp git-credential-nostr buzz; do
    touch "desktop/src-tauri/binaries/${bin}-${TARGET}"
done

On Windows the host triple is x86_64-pc-windows-msvc, and Tauri's
externalBin validation expects sidecars named
binaries/<bin>-x86_64-pc-windows-msvc.exe. The stubs are created without the
.exe suffix, so Tauri rejects them and every recipe that depends on
_ensure-sidecar-stubs (dev, desktop-tauri-check, desktop-tauri-clippy,
desktop-tauri-test, desktop-standalone, staging) fails on Windows even
though the code itself builds fine.

Suggested fix

Append .exe when the host triple contains windows:

EXT=""
case "$TARGET" in *windows*) EXT=".exe";; esac
for bin in buzz-acp buzz-agent buzz-dev-mcp git-credential-nostr buzz; do
    touch "desktop/src-tauri/binaries/${bin}-${TARGET}${EXT}"
done

(For actual bundling, empty touch-ed stubs are not runnable, of course — for
release builds the real target/…/<bin>.exe outputs get copied into place,
which is what desktop-release-build does on other platforms. This issue is
only about the stub naming that gates the compile/check recipes.)

Environment

• Windows 11 Pro 25H2 (build 26200), Git Bash available for Justfile shebang recipes
• Buzz @ v0.4.23, just 1.57