Fix TL2 kernel batch output stride bug causing NaN for batch_size > 1

[vladimirmoushkov]

Summary

Fixes a critical bug in the TL2 LUT kernel codegen where multi-token prompt
evaluation (batch_size > 1) produces NaN/garbage output.

Bug

In utils/codegen_tl2.py, the generated three_qgemm_lut_* and two_qgemm_lut_*
functions write all batch elements to C[i] instead of C[bs * out_stride + i],
overwriting previous batch results. Single-token generation works; any multi-token
prompt crashes with NaN.

Fix

1. utils/codegen_tl2.py: Added int out_stride to kernel signatures,
   fixed output indexing to C[bs * out_stride + i], pass m as stride from dispatcher
2. NaN guard: per_tensor_quant() now handles division by zero when max activation is 0
3. nan-guards-ggml.patch: Defensive fixes for quantize_row_i8_s() and I2_S
   scale application in the submodule

Testing

• Verified single-token generation still works (no regression)
• Verified multi-token chat template prompts now produce correct, coherent output
• Tested with both Debug and Release builds

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