Stage 17 (#14): raise robot early-move band [1,5] -> [3,10] min (slower openings)

docs/ARCHITECTURE.md

@@ -321,7 +321,7 @@ English game the Latin pool.
   refill it, else passes.
 - **Timing**: the per-move delay is **move-number-aware** — a right-skewed sample
   (exponent k=4, short delays frequent) from a band that interpolates from
-  **[1, 5] min** at the first move to **[10, 90] min** by ~28 moves, so openings are
+  **[3, 10] min** at the first move to **[10, 90] min** by ~28 moves, so openings are
   quick and the endgame can run long, clamped to **[1, 90] minutes**; it
   **sleeps 00:00–07:00** anchored to the **opponent's** profile timezone with a
   per-game drift of **±3 h** (fallback UTC), so its night overlaps the human's