fix(dev-tunnel): run cli from packaged bin shims

[skulidropek]

Summary

• treat spawned bin shims as valid CLI entrypoints for the tunnel executable
• keep index imports testable without breaking packaged runtime execution

Testing

• npm test
• npm run build

[skulidropek]

Implemented: this hotfix restores real CLI execution for the packaged spawn-dock-tunnel bin while keeping index.ts safe to import in tests. Without it, the new TMA banner logic stayed silent because the .bin shim path no longer matched the stricter entrypoint guard.