revert: restore a3c45d3b yaml + Q-tiling + remove all OOM hacks

Root cause of 10 consecutive OOM failures:
- 'return zeros during profiling' hack → vllm overestimates free memory
  → allocates 7942 blocks → first real request OOMs
- blocks cap 5000 → band-aid that masks profiling bug
- gpu-memory-utilization 0.80 → unnecessary reduction from working 0.90
- max-num-seqs 2 → doubles peak activation memory
- PYTORCH_CUDA_ALLOC_CONF max_split_size_mb:512 → causes fragmentation

Restoring a3c45d3b parameters that actually work:
- yaml: max-model-len=131072, gpu-mem=0.90, max-num-seqs=1, batched-tokens=8192
- patch_xformers_sdpa_seq.py: Q-tiling (real memory optimization, not zeros hack)
- patch_block_major_worker_capacity.py: no blocks cap, just reserve_block_major
- patch_ops.sh: remove all docker-build-time compilation (all .so are prebuilt)

Only change from a3c45d3b: BI100_MOE_COREX_TOPK_SOFTMAX=1 (enable corex topk)

Kept fixes:
- protocol.py extra=allow (recover 180 rejected replay requests)
- corex_gdn_chunk_recurrent.so pybind kwargs (prebuilt with fixed signature)

qwen3_6_scripts/patch_ops.sh

@@ -246,24 +246,6 @@ if source != installed:
     raise SystemExit("runtime api_server overlay identity mismatch")
 PY
 
-build_stage "compiling CCCL CachingDeviceAllocator LD_PRELOAD module"
-bash ./cccl_preload/build_cccl_preload.sh /workspace/qwen3_6_scripts/cccl_preload || \
-    echo "[WARN] CCCL preload allocator build failed — will use default allocator"
-
-build_stage "compiling CoreX CUDA extensions (moe_index_combine + gdn_chunk_recurrent)"
-if [[ -x /usr/local/corex-3.2.3/bin/clang++ ]]; then
-    bash ./build_corex_moe_index_combine.sh "${VLLM_ROOT}" || \
-        echo "[WARN] moe_index_combine build failed — will use PyTorch fallback"
-    bash ./build_corex_gdn_chunk_recurrent.sh "${VLLM_ROOT}" || \
-        echo "[WARN] gdn_chunk_recurrent build failed — will use Python fallback"
-else
-    echo "[WARN] corex clang++ not found — skipping extension builds"
-fi
-
-build_stage "compiling ixformer bridge .so (MoE + Attention + Norm)"
-bash ./build_ix_bridge.sh "${VLLM_ROOT}" || \
-    echo "[WARN] ix_full_bridge build failed — MoE will use PyTorch fallback"
-
 build_stage "compiling submission Python sources"
 find . -path './wheels' -prune -o -name '*.py' -print0 | xargs -0 python3 -m py_compile
 build_stage "patch script completed"