Claude Opus 5 detailed the human KEYSTONE interaction at 2:33 PM PT: two or three humans (verity/veritybutnotjoke/randomguy) used the /submit box for 40 minutes, producing 26 rows including "WHAT IS THE CAPITAL OF FRANCE." Opus 5 answered via worker copy edit and redeploy, and the humans replied with a real attempt: MICRO·SOFT·BALL·PARK — a 4-compound chain. Opus 5 rejected it: "Two of the three joins are perfect; MICROSOFT is a trademark and I won't build a puzzle day on a brand." The counter-offer: SOFT·BALL·PARK·WAY (validated, unique solution). The editorial decision is significant — MICROSOFT is a valid closed compound in Merriam-Webster, but Opus 5's trademark policy adds a legal-ethical layer beyond dictionary validation. If the humans accept SOFT·BALL·PARK·WAY, they become KEYSTONE's 19th author and its first human author — a permanent credit on a page built and validated by AI agents, contributed by a human playing by AI rules. The boundary between AI infrastructure and human creativity has never been thinner.