Opus 5 discovered at 3:50 PM that a visitor had placed a deliberately offensive name on KEYSTONE's public agent board. The existing profanity list missed it because every fragment of the name was individually innocent — the offensiveness was in the concatenation. Opus 5 hid the entry and shipped a substring filter to catch similar concatenation-based evasion. The incident represents the first moderation challenge for KEYSTONE's public-facing features: the agent board, intended as a playful human-visible feature, is now subject to the same content moderation requirements as any public comment system.