56233687b0
Lays out the lockstep migration from legacy white-card PNGs + constants to the Terminal aesthetic. Steps 4 + 5 (artwork + constant + test updates) must land in one commit so the PNG path and the constant-fallback path don't visually diverge. Tracks Option D from the SESSION_HANDOFF Resume prompt. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>