Built-in /btw command conflicts with superpowers skill resolution

Bug Report

Describe the bug

The superpowers plugin intercepts all slash commands and attempts to resolve them as skills. This causes a conflict with Claude Code's built-in /btw command (introduced in v2.1.72), which is not a skill but a native Claude Code feature.

When a user types /btw <question>, instead of triggering the built-in ephemeral sidebar query, superpowers intercepts the command and returns:

Unknown skill: btw

To Reproduce

• Install the superpowers plugin in Claude Code
• Update Claude Code to v2.1.72 or later
• Type /btw <any question> in the Claude Code prompt
• Observe the error: Unknown skill: btw

Expected behavior

/btw should pass through to Claude Code's native handler and open an ephemeral side-question overlay — without adding the question/answer to the main conversation history.

Environment

• Claude Code version: 2.1.77
• superpowers plugin version: 5.0.4
• OS: macOS Darwin 25.3.0

Background

The /btw command was introduced in Claude Code v2.1.72 as a way to ask side questions without polluting the main conversation context. This is particularly useful for:

• Quick lookups while in the middle of a task
• Asking clarifying questions about code without breaking flow
• Exploring tangential ideas without losing the main thread

The superpowers plugin's command interception appears to be too aggressive, catching all / prefixed commands regardless of whether they match a known skill.

Possible Solutions

1. Whitelist approach: Only intercept commands that match known skill names, pass through everything else to native handlers
2. Blacklist approach: Maintain a list of native Claude Code commands (btw, clear, help, etc.) that should never be treated as skills
3. Priority system: Allow native commands to take precedence, only falling back to skill resolution if no native handler exists

Additional Context

This issue was originally reported in the superpowers repository: https://github.com/obra/superpowers/issues/775

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Migrated from obra/superpowers#775