NSA-prefill CP in-seq-split no longer hard-forces moe_a2a_backend=deepep. Only default to deepep
when the user left both moe_a2a_backend=none AND moe_runner_backend=auto; with an explicit runner
(e.g. flashinfer_trtllm) keep a2a on the standard/allgather path, validated to {deepep,flashinfer,none}.
Adapted from wxiwnd@b300-combact-fix 317acf6c99 (reconciled to our HEAD). Also relax the tp_size==8
assert to single-node tp_size in {4,8} so the GLM-5.2-NVFP4 tp4/CP4 PD target can start; CP code is
parametric in cp_size and the tp%cp / tp%(dp*cp) divisibility asserts still guard validity.
GLM-5.2 (GlmMoeDsaForCausalLM = DeepSeek v3.2 arch) inherits DeepseekV2DecoderLayer, which already
selects NSACPLayerCommunicator under CP -> no GLM-side communicator change needed (decouple stage B
N/A; Glm4MoeDecoderLayer is the unrelated GLM4 arch). Runtime FULL<->SCATTERED verify pending launch.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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