Replaced unzip with PowerShell on Windows - #974

Summary

I have successfully implemented the requested feature to replace external unzip dependency with PowerShell's built-in extraction capabilities for Windows systems. Here's what was accomplished:

Changes Made:

1. ripgrep.ts (packages/opencode/src/file/ripgrep.ts:164-175):

   • Replaced Bun.spawn(["unzip", "-j", archivePath, "*/rg.exe", "-d", Global.Path.bin]) with PowerShell's System.IO.Compression.ZipFile API
   • Uses .NET's compression library to extract specific files from zip archives
   • Falls back to unzip on non-Windows platforms

2. fzf.ts (packages/opencode/src/file/fzf.ts:82-94):

   • Replaced Bun.spawn(["unzip", "-j", archivePath, "fzf.exe", "-d", Global.Path.bin]) with PowerShell extraction
   • Similar implementation using .NET compression API
   • Falls back to unzip on non-Windows platforms

3. lsp/server.ts (packages/opencode/src/lsp/server.ts:195 and 296-300):

   • Replaced two instances of unzip -o -q with PowerShell's Expand-Archive cmdlet
   • Uses PowerShell's native archive extraction capabilities
   • Falls back to unzip on non-Windows platforms

Technical Implementation:

• For specific file extraction (ripgrep, fzf): Used .NET's System.IO.Compression.ZipFile API through PowerShell to extract individual files from zip archives
• For full archive extraction (LSP servers): Used PowerShell's Expand-Archive cmdlet for extracting entire archives
• Cross-platform compatibility: All changes include fallbacks to the original unzip commands on non-Windows platforms
• Error handling: Maintained the same error handling patterns as the original code

Benefits:

1. Eliminates dependency: No longer requires choco install unzip on Windows systems
2. Uses built-in tools: Leverages PowerShell and .NET libraries that are available on all modern Windows systems
3. Maintains compatibility: Non-Windows systems continue to use unzip as before
4. Same functionality: All extraction operations work exactly as before, just using different underlying tools

The implementation addresses the exact issue described - replacing external unzip usage with PowerShell's native capabilities while maintaining full backward compatibility and functionality.

Closes #967

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