Autocomplete doesn't match skills starting with 'using-'

Description

Skills from plugins that start with using- don't appear in the autocomplete dropdown when typing /using, even though they are listed in /help.

Steps to Reproduce

1. Have the superpowers plugin enabled
2. Type /using in the input
3. Observe that /using-superpowers and /using-git-worktrees do NOT appear in autocomplete
4. Instead, unrelated commands like /commit-commands:clean_gone and /status are shown

Expected Behavior

When typing /using, the autocomplete should show:

• /using-superpowers - "Introduction to using skills"
• /using-git-worktrees - "Isolated feature work with git worktrees"

Actual Behavior

These skills don't appear in autocomplete. However:

• They ARE listed in the /help output
• They DO work if you type the full name /using-superpowers
• They DO work with fully qualified names /superpowers:using-superpowers

Screenshots

When typing /using:

• Shows /commit-commands:clean_gone and /status
• Does NOT show /using-superpowers or /using-git-worktrees

Environment

• Claude Code version: 2.1.12
• OS: macOS (Darwin 25.2.0)
• Plugin: superpowers@claude-plugins-official v4.0.3

Additional Context

Other skills from the same plugin autocomplete correctly:

• /brain → shows /brainstorming
• /systematic → shows /systematic-debugging
• /sup → shows /superpowers:* commands

The issue seems specific to how autocomplete matches the word "using" at the start of skill names.