Please deep think / ultrathink as this is a complex task.

extract-domain

Collaboratively identify and formalize an existing codebase concept as a named domain without moving files. This is a workshop with the user, not an automated refactor. The goal is communication — future plans can reference "the auth domain" and everyone knows what that means.

User input:

$ARGUMENTS
# Expected:
# <concept>                    — the concept to extract (e.g., "authentication", "billing")
# Optional flags:
# --domain <slug>              — override the auto-generated slug
# --list                       — list existing domains and exit

What This Command Does