[BUG] install command fails to recognize Windows absolute paths (C:/ and /c/ formats)

[abevol]

Bug Description

The install command's isLocalPath() function only recognizes Unix-style paths (/, ./, ../, ~/), causing it to fail on Windows absolute paths. This makes it impossible to install local skills on Windows using absolute paths.

Environment

• OS: Windows (with Git Bash/MSYS2)
• openskills version: 1.5.0
• Node.js version: (tested on v20.x)

Current isLocalPath() Implementation

function isLocalPath(source: string): boolean {
  return (
    source.startsWith('/') ||      // Unix absolute
    source.startsWith('./') ||     // Relative
    source.startsWith('../') ||    // Parent relative
    source.startsWith('~/')        // Home directory
  );
}

Problem Cases

All of the following Windows paths are incorrectly treated as GitHub repositories:

Path Format	What Happens	Error
C:/Users/...	Treated as GitHub repo	Tries to clone https://github.com/C:/Users/...
/c/Users/... (Git Bash)	Treated as GitHub repo	Same error
~/.agent/...	Auto-converted to C:/Users/... by Git Bash	Same error
~\agent\...	Not recognized as local path	"Invalid source format"
C:\Users\...	Not recognized as local path	"Invalid source format"

Test Results with MSYS_NO_PATHCONV

Setting MSYS_NO_PATHCONV=1 doesn't solve the problem:

# Still fails - path treated as GitHub repo
MSYS_NO_PATHCONV=1 npx openskills install C:/Users/jayvi/.agent/skills/gh-cli

# Fails - /c/ parsed as C:\c\ (extra \c)
MSYS_NO_PATHCONV=1 npx openskills install /c/Users/jayvi/.agent/skills/gh-cli

Expected Behavior

All these paths should be correctly recognized as local paths:

# Windows absolute (forward slash)
npx openskills install C:/Users/jayvi/.agent/skills/gh-cli

# Windows absolute (backslash)
npx openskills install C:\Users\jayvi\.agent\skills\gh-cli

# Git Bash style
npx openskills install /c/Users/jayvi/.agent/skills/gh-cli

# Windows home directory
npx openskills install ~\.agent\my-skills\skills\gh-cli

Proposed Solution

Update isLocalPath() to support Windows path formats:

function isLocalPath(source: string): boolean {
  return (
    source.startsWith('/') ||
    source.startsWith('./') ||
    source.startsWith('../') ||
    source.startsWith('~/') ||
    source.startsWith('~\\') ||                    // Windows home
    /^[a-zA-Z]:[/\\]/.test(source)               // Windows drive (C:/ or C:\)
  );
}

And update expandPath() to handle Git Bash /c/Users/ → C:\Users\ mapping and Windows backslashes.

Workaround

Currently, the only reliable way to install local skills on Windows is using relative paths:

cd ~/.agent/my-skills
npx openskills install ./skills/gh-cli --global --universal -y

Additional Context

This affects all Windows users trying to install local skills from absolute paths, making the CLI less intuitive and requiring users to navigate to specific directories first.