Bug: Plugin command /omp:guide shows Unknown command but works with --plugin-dir

Bug Description

Plugin command /omp:guide shows "Unknown command" when installed via enabledPlugins, but works with --plugin-dir mode.

Steps to Reproduce

1. Install plugin with enabledPlugins enabled (user scope)
2. Run claude -p --print "/omp:guide"
3. Result: "Unknown command: /omp:guide"

Expected Behavior

/omp:guide should work the same as other commands like /omp:survey, /omp:setup, etc.

Environment

• Claude Code version: (check with claude --version)
• OS: macOS
• Plugin: oh-my-paper v1.1.0

Additional Context

• /omp:survey works fine
• /omp:setup works fine
• Using --plugin-dir flag makes /omp:guide work correctly
• Same cache directory, same file timestamps as working commands (all SKILL.md files have identical timestamps)
• This appears to be a bug in the installed plugin mechanism, not a file or configuration issue