Add Qwen3.5 VLM CI

[zhuzilin]

Register the Geo3K Qwen3.5-4B VLM smoke test in the permanent PR workflows and document the new VLM coverage.\n\nCo-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

[coding-famer]

I think the Qwen3.5 VLM bridge mode requires upgrading the Megatron‑Bridge. The example uses a different branch:

slime/examples/geo3k_vlm/run_geo3k_qwen35.sh

Lines 11 to 12 in 913b3c4

	# TODO: Remove this once Megatron & Megatron Bridge are upgraded upstream.
	pip install git+https://github.com/coding-famer/Megatron-Bridge-slime.git@qwen35 --no-build-isolation

[zhuzilin]

I think the Qwen3.5 VLM bridge mode requires upgrading the Megatron‑Bridge. The example uses a different branch:

get~ hmm... I'll try to convert the ckpt to torch dist with mbridge for this ci. the current code should be able to run qwen3.5 at the moment.

[coding-famer]

I think the Qwen3.5 VLM bridge mode requires upgrading the Megatron‑Bridge. The example uses a different branch:

get~ hmm... I'll try to convert the ckpt to torch dist with mbridge for this ci. the current code should be able to run qwen3.5 at the moment.

VLMs have customized Megatron model classes, which depend on Megatron-Bridge, as well as the weight updating👀