Adds `cw account extract [--email <email>]` subcommand to the accountCommand
group. Reads directly from the local Claude config via extractCurrentClaudeAccount()
without requiring a server connection. Supports optional email verification,
outputting JSON with email, configJson (stringified), and credentials fields.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
