dump_tensors now ACCUMULATES per-(layer,stage) into a forward buffer (every fwd_hash
stage at every layer + nsa q_all/attn_out/topk all layers, kv_cache at a layer spread);
dump_flush writes one file per (rid,rank) at model end with the full trajectory + final
hidden + positions + seq/prefix metadata. Gated to cache-hit extends only (skip fresh
full prefills) so --repeat 2 dumps just the L1-hit + L2-reload (small). dump_diff joins
A(rep1) vs C by idx, relerr per token-order stage -> first divergent layer.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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