Batch cleanup of references to the removed onboarding flow:
- 13 comment sites mentioning 'onboarding' updated to reflect the
new /new-workspace flow or removed where no longer accurate
- CLI waitForOnboarding renamed to waitForWorkspaceCreation (function
name + docstring); behavior unchanged
The 'onboarding' reserved slug entries (frontend + backend) are
intentionally retained — see prior commit rationale.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>