Slash command autocomplete should search against group/namespace tags, not just skill display name

Problem

Skills from packages like superpowers are displayed in autocomplete with a group tag — e.g., /requesting-code-review (superpowers). However, the autocomplete search only matches against the display name, not the group tag.

This means typing /superpowers does not surface any of the ~15 active superpowers skills (requesting-code-review, systematic-debugging, test-driven-development, etc.). It only matches the 3 deprecated stubs that happen to have "superpowers" literally in their display name.

This makes it impossible to discover all skills in a package by typing the package name, which is the most natural way to browse them.

Expected behavior

Typing /superpowers should match against the group tag (superpowers) and show all skills in that namespace.

Current behavior

• /superpowers → shows only 3 deprecated stubs (display names: superpowers:write-plan, superpowers:brainstorm, superpowers:execute-plan)
• /requesting → shows requesting-code-review with (superpowers) tag — but this skill is not discoverable by typing /superpowers

Environment

• Claude Code v2.1.81
• macOS