fix:findable keyfile variations

[PSkinnerTech]

Changes Made

• ✅ Enhanced wallet detection to properly handle keyfile*.json patterns

Core Implementation

export function checkWalletExists(): boolean {
  const dir = process.cwd();
  const files = fs.readdirSync(dir);
  
  return files.some(file => 
    file === 'wallet.json' || /^keyfile.*\.json$/.test(file)
  );
}

Testing Plan

• Unit Tests
  • Verify wallet.json detection
  • Verify keyfile*.json pattern detection
  • Test missing wallet scenarios
• Integration Tests
  • Test wallet check command flow
  • Verify proper error messages

Next Steps

• Consider adding support for additional wallet file patterns
• Add more detailed error messages about supported wallet formats

Security

• No changes to security implications
• Maintains existing file permission checks
• Only reads file names, not contents during detection

Breaking Changes

None. This change enhances existing functionality without breaking current behavior.

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PR Checklist

• Tests added/updated
• Documentation updated
• Changelog updated
• Version bumped (not needed for enhancement)
• Security implications considered