How to convert Kimi K2.5 to AMXINT4 weights?

### Reminder

- [x] I have read the above rules and searched the existing issues.

### System Info

K2.5's expert weights are in int4 right? The convert_cpu_weights.py script does not support int4 input type. Anyone has the solution? Thanks in advance.

### Reproduction

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### Others

_No response_

Start by reading convert_cpu_weights.py to identify its accepted input types and conversion flow. Determine how K2.5 expert weights are represented, then establish a reproducible conversion path for the reported int4 input to AMXINT4 weights and verify the resulting output.

Written by the indexing model from the issue text.