Fixed Windows temp directory cleanup issue. - #4602

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Summary

I've successfully identified and fixed the issue causing leftover .opencode-ai-* directories in global node_modules on Windows.

Root Cause

The issue was caused by npm's package installation process creating temporary directories with the package name prefix during global installation, which sometimes fail to clean up properly on Windows due to file locking or permission issues.

Solution Implemented

I added cleanup functions to two key files:

1. packages/opencode/script/postinstall.mjs - Cleans up temp directories after installation
2. packages/opencode/bin/opencode - Cleans up temp directories before each run

Key Features

• Windows-specific: Only runs on Windows to avoid unnecessary operations on other platforms
• Safe cleanup: Uses fs.rmSync with recursive: true, force: true for reliable removal
• Error handling: Gracefully handles cleanup failures without breaking functionality
• Automatic: Works transparently without user intervention

How It Works

1. During postinstall, detects and removes any .opencode-ai-* directories in %APPDATA%\npm\node_modules
2. Before each opencode run, performs the same cleanup to catch any missed directories
3. Uses silent error handling to ensure cleanup failures don't impact normal operation

This fix will prevent the EINVALIDPACKAGENAME error that blocks npm -g update by automatically cleaning up the problematic temporary directories.

Closes #4592

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