[OpenVINO] Add support for Zyphra ZAYA

[mlukasze]

⚠️ AUTOMATICALLY GENERATED BY MEAT AGENT — REQUIRES HUMAN REVIEW ⚠️
This PR was created by an AI agent as part of automated model enablement.
A human maintainer must review and approve it before it can be considered for merge.
Do NOT merge without human review and sign-off.

What does this PR do?

Adds OpenVINO export and runtime support for Zyphra ZAYA (zaya) — a hybrid attention + recurrent architecture implemented in Transformers as ZayaForCausalLM.

Installation instructions

pip install git+https://github.com/mlukasze/optimum-intel.git@feat/add-zaya-support
pip install --pre -U openvino openvino-tokenizers nncf --extra-index-url https://storage.openvinotoolkit.org/simple/wheels/nightly

Exporting cmd-line

optimum-cli export openvino -m Zyphra/ZAYA1-8B --task text-generation-with-past --weight-format int4 zaya1-8b-ov/

Inference script

from optimum.intel import OVModelForCausalLM
from transformers import AutoTokenizer

model = OVModelForCausalLM.from_pretrained('zaya1-8b-ov/')
tokenizer = AutoTokenizer.from_pretrained('Zyphra/ZAYA1-8B')
inputs = tokenizer('Hello, how are you?', return_tensors='pt')
outputs = model.generate(**inputs, max_new_tokens=20)
print(tokenizer.decode(outputs[0], skip_special_tokens=True))

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?