docs(serving): correct gather NaN root cause + record the hardening - #2148
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…ch mismatch, not addressing The doc credited the alignment invariant; the actual 5090 root cause was a gate that accepted shapes CUDA dispatches to MMQ (no gather), which reads the contiguous staging the consume-arm intentionally leaves unpopulated for aliased experts. Records the generalizable rule (supports_op must mirror the dispatch predicate exactly) and what the hunt bought as hardening: the identity-table bisect instrument, fence precision, and opt-in event retirement with the measured reason it is not the default. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LoTjvf5j3Ez13g6k8mRkFo
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supports_op/dispatch mismatch was the real cause; alignment + fence work lands as hardening with measured defaults.
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https://claude.ai/code/session_01LoTjvf5j3Ez13g6k8mRkFo