Distil v31.3: Goodhart safeguards, axis reallocation, autonomous ops

Distil deployed anti-overfitting measures including seeded RNG items, topical distractors, and name rotation to prevent test-set memorization. The composite ranking formula now uses 0.85 × worst_5_mean + 0.15 × weighted across 19 axes after a bug fix and reallocation: top_k_overlap halved from 0.18 to 0.09 due to negative correlation with held-out performance, with gains going to on_policy_rkl (0.30 → 0.39). An autonomous healthcheck watchdog stack went live to enable 30+ day unattended operation; current king is UID 229 (composite.final 0.558).

• •Anti-Goodhart: seeded RNG, GSM-NoOp perturbations, first-name rotation within gender pools
• •top_k_overlap cut 50% (r = -0.481 vs. held-out gsm8k); on_policy_rkl bumped to 0.39
• •Autonomous healthcheck timer + runbook live; detection ceiling 3–5 min
• •Announcement formula bug fixed; dashboard now shows α=0.85, K=5 dynamically
• •Two v31 generators still broken (gsm_symbolic, ifeval_verifiable); GitHub roadmap last updated 2026-04-26