test: probe ixformer .so symbols for MoE grouped GEMM

CUTLASS grouped GEMM (example 24) requires SM80 Tensor Core + cuda/std headers.
Cannot compile on corex (same issue as CCCL 3.6 variadic functions).

Alternative path: ix_moe_bridge.so calls ixformer::infer::moe_w16a16_group_gemm
which is BI-V100 optimized grouped GEMM already in the base image.

This probe script checks if the MoE functions exist in ixformer .so
before attempting to build ix_moe_bridge.so.

Run: bash qwen3_6_scripts/probe_ixformer_symbols.sh

qwen3_6_scripts/probe_ixformer_symbols.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+# probe_ixformer_symbols.sh — Check what ixformer::infer functions are available
+# Run: bash qwen3_6_scripts/probe_ixformer_symbols.sh
+
+echo "=== Locate ixformer .so ==="
+python3 -c "
+import ixformer, os, glob
+d = os.path.dirname(ixformer.__file__)
+print(f'ixformer dir: {d}')
+for f in glob.glob(os.path.join(d, '*.so')):
+    print(f'  {os.path.basename(f)}  ({os.path.getsize(f)} bytes)')
+" 2>/dev/null
+
+IXFORMER_SO=$(python3 -c "
+import ixformer, os, glob
+d = os.path.dirname(ixformer.__file__)
+sos = glob.glob(os.path.join(d, '*ixformer*.so'))
+print(sos[0] if sos else '')
+" 2>/dev/null)
+
+if [ -z "$IXFORMER_SO" ]; then
+    echo "ixformer .so not found"
+    exit 1
+fi
+
+echo ""
+echo "=== MoE functions (grouped GEMM pipeline) ==="
+nm -D "$IXFORMER_SO" 2>/dev/null | grep -i "moe_w16a16\|group_gemm\|moe_expand\|moe_compute_token\|moe_output_reduce\|topk_softmax" | head -20
+
+echo ""
+echo "=== Attention functions ==="
+nm -D "$IXFORMER_SO" 2>/dev/null | grep -i "flash_attn_unpad\|paged_attention\|xllm_paged" | head -10
+
+echo ""
+echo "=== Linear functions ==="
+nm -D "$IXFORMER_SO" 2>/dev/null | grep -i "ixformer_linear\|residual_rms_norm" | head -10
+
+echo ""
+echo "=== All ixformer::infer symbols ==="
+nm -D "$IXFORMER_SO" 2>/dev/null | grep "ixformer.*infer\|ixinfer" | wc -l
+echo "total symbols"
+
+echo ""
+echo "=== Also check _ixformer_torch .so ==="
+find /usr/local/corex -name "*ixformer*torch*.so" 2>/dev/null | head -5
+TORCH_SO=$(find /usr/local/corex -name "*ixformer*torch*.so" 2>/dev/null | head -1)
+if [ -n "$TORCH_SO" ]; then
+    echo "MoE symbols in torch ext:"
+    nm -D "$TORCH_SO" 2>/dev/null | grep -i "moe_w16a16\|group_gemm\|topk_softmax\|moe_expand\|moe_compute" | head -20
+fi
+
+echo ""
+echo "=== corex lib64 ixformer ==="
+ls /usr/local/corex/lib64/libixformer* 2>/dev/null
+if [ -f /usr/local/corex/lib64/libixformer.so ]; then
+    echo "MoE symbols in libixformer.so:"
+    nm -D /usr/local/corex/lib64/libixformer.so 2>/dev/null | grep -i "moe_w16a16\|group_gemm\|topk_softmax" | head -20
+fi