rid 'dumpfh-' -> dump ONLY the model's final hidden (last token, post-CP-gather = the first-token source), allowed on FRESH prefills too -> the cache-bust-vs-cache-hit discriminator (prefill-side vs decode-side). rid 'dump-' keeps the lean per-layer trajectory (cache-hit only). Flush moved after the CP gather. dump_diff generalized to compare any two phases. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>