chore: untrack session scratch report accidentally force-added

.superpowers/sdd/* is git-ignored scratch; the file remains on disk.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JYNmieH7AYvXys56bV8B7p

Author: barscn