SSH connection fails on macOS server due to Linux-specific flock command usage

When connecting to a macOS server via SSH, Windsurf attempts to use the Linux-specific 'flock' command which doesn't exist on macOS servers. This causes the server installation to fail.

Steps to reproduce:

1. Configure SSH connection to a macOS server in ~/.ssh/config
2. Attempt to connect via Windsurf Remote SSH
3. Installation fails with "flock: command not found" error

Expected behavior:
Windsurf should either:

1. Use macOS-compatible locking mechanisms
2. Skip non-essential locking steps on macOS servers
3. Have a platform-specific implementation for server installation

Additional info:

• Server OS: macOS
• Windsurf version: 1.9.2
• SSH version: OpenSSH_9.9p2