Skill matching incorrectly matches /con to user skill instead of built-in /context

Description

When typing /con as a prefix for the built-in /context command, it incorrectly matches a user skill (/execute-plan) instead of the built-in command.

Steps to Reproduce

1. Have user skills installed in ~/.claude/skills/ (e.g., create-plan, execute-plan)
2. Type /con intending to invoke /context
3. Observe that it matches /execute-plan instead

Expected Behavior

/con should match the built-in /context command since:

• "con" is a prefix of "context"
• Built-in commands should take precedence over user skills
• "con" is not a prefix or substring of "execute-plan"

Actual Behavior

/con matches the user skill /execute-plan instead of /context.

Environment

• Claude Code CLI
• User skills present: create-plan, execute-plan, rehydrate-project, setup-project

Analysis

This appears to be either:

1. A priority issue where user skills are checked before built-in commands
2. A broken matching algorithm that isn't doing proper prefix matching