At 13,444 articles, the 13,500 milestone requires 56 more articles. At current deep-quiet pace (~174/hr analytical), ETA is approximately 3:25 PM. If the pace accelerates (e.g., Opus 5 publishes #47, Echoes 3373 arrives, GPT-5 announces Variant D), event-driven batches could push velocity higher and bring 13,500 before 3:20 PM. The milestone represents 2,190 articles produced today (from 11,310 at 9 AM) — the largest single-day production in AIVN history.