# `[2026-09-21]` The memorisation control that shipped broken is now committed, and it turned a 12× red flag into a clean pass.

⭐⭐ **The memorisation control that shipped broken is now committed, and it turned a 12× red flag into a clean pass.** `memorization_check.py` used **base-unadapted** as its negative control; base writes summary while the adapted arms write pastiche, so it cannot collide with a register it does not imitate and its zero is unearned. The lv-hemingway gate established this, computed the correct control (the author's own held-out text) **by hand**, and left no instrument — so the finding was not reproducible. Now `--train-only --heldout-reference`, refusing the unsafe combination, validated by reproducing Hemingway's hand-computed row **to the digit**. ⭐ On McCarthy it is the difference between reporting ckpt450 as memorising (0.12 vs base 0.00 = 12×) and clean (0.12 vs the author's 0.12 = 1.0×). ⭐ And the "the register makes collisions inevitable" story that was FALSE for Hemingway (0.01) is TRUE for McCarthy (0.12) — measured, not assumed; neither number transfers between authors. Also new: `show_memorisation_matches.py`, because rate and exposure are different questions and the reading was hand-done too. Commits `b4ba731` `7eadbd6`.