Adds a visible "CRITICAL" warning and pre-submission checklist to the polecat template. Explicitly notes that polecats should NOT manually close the root issue - the Refinery handles that after merge. This addresses the intent of PR #287 while avoiding the conflicting `bd close` instruction that would break the Refinery workflow. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>