[BUG] -o parameter does not expand tilde (~) to user home directory on Windows

[abevol]

Bug Description

On Windows, the -o parameter does not correctly expand the tilde (~) character to the user's home directory. Instead, it treats ~ as a literal directory name.

Environment

• OS: Windows
• openskills version: 1.5.0

Steps to Reproduce

1. Open a terminal on Windows
2. Run:

   npx openskills sync -o ~/.config/opencode/AGENTS.md

Expected Behavior

The file should be written to:

C:\Users\<username>\.config\opencode\AGENTS.md

Actual Behavior

The file is created at:

<CurrentPath>\~\.config\opencode\AGENTS.md

The ~ is not expanded to the user's home directory and is instead treated as a literal directory name in the current working directory.

Possible Solution

The path expansion logic should handle the tilde (~) character and expand it to the user's home directory (using os.homedir() or similar) before resolving the full path.

Additional Context

This works correctly on Unix-like systems where the shell expands ~ before passing it to the program. However, on Windows, this expansion does not happen automatically, so the application needs to handle it internally.