[Feat] add vllm-omni version collection

[sihyeonn]

PLEASE FILL IN THE PR DESCRIPTION HERE ENSURING ALL CHECKLIST ITEMS (AT THE BOTTOM) HAVE BEEN CONSIDERED.

Purpose

Add vllm_omni_version field to collect_env.py for collecting vLLM-Omni package version with git commit SHA.

This helps users report their exact vLLM-Omni version when filing issues, especially since most users install via editable mode (uv pip install -e .) rather than released packages.

Changes:

• Add vllm_omni_version field to SystemEnv namedtuple
• Add get_vllm_omni_version() function that:
  • Supports setuptools-scm versioned packages (parses git sha from version tuple)
  • Falls back to git rev-parse --short HEAD for editable installs
• Display vLLM-Omni version in output under "vLLM Info" section

Future improvement suggestion:

Consider adopting setuptools-scm (like vLLM does) to automatically embed git SHA into version at install time. This would:

• Capture the exact commit at pip install time (not current HEAD)
• Work for both editable and regular installs
• Generate versions like 0.12.0rc1.dev5+gdde96c2

Test Plan

python collect_env.py | grep -A5 "vLLM Info"

Test Result

==============================
         vLLM Info
==============================
.
.
vLLM-Omni Version            : 0.12.0rc1 (git sha: dde96c2)
.
.

---

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft.

BEFORE SUBMITTING, PLEASE READ https://github.com/vllm-project/vllm-omni/blob/main/CONTRIBUTING.md (anything written below this line will be removed by GitHub Actions)

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add vllm_omni_version field to SystemEnv

The SystemEnv namedtuple is still defined without a vllm_omni_version field, but get_env_info() now passes vllm_omni_version= into the constructor. This raises TypeError: __new__() got an unexpected keyword argument 'vllm_omni_version' whenever collect_env.py runs, so the env collection fails entirely. You need to add the field to the SystemEnv definition (near the top of this file) to keep the constructor signature in sync.

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[ZJY0516]

Thanks for contribution

[ZJY0516]

Could we configure the build process to automatically embed the Git SHA into the package version during installation?
@congw729

[sihyeonn]

@ZJY0516 Thanks, also I opened #741

[congw729]

LGTM. Thanks for your contribution.