[Diffusion] update code owner

[BBuf]

Motivation

#14717

Modifications

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.

Review Process

1. Ping Merge Oncalls to start the PR flow. See the PR Merge Process.
2. Get approvals from CODEOWNERS and other reviewers.
3. Trigger CI tests with comments or contact authorized users to do so.
   • /tag-run-ci-label, /rerun-failed-ci, /tag-and-rerun-ci
4. After green CI and required approvals, ask Merge Oncalls to merge.

[gemini-code-assist]

Summary of Changes

Hello @BBuf, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the .github/CODEOWNERS file to reflect changes in ownership for specific directories related to diffusion and multimodal generation components. It introduces new codeowners for a diffusion-specific JIT kernel path and expands the ownership for existing multimodal generation runtime layers and models, ensuring proper review assignments for these areas.

Highlights

• New Codeowner for Diffusion JIT Kernel: The .github/CODEOWNERS file has been updated to assign @yingluosanqian, @BBuf, and @mickqian as codeowners for the /python/sglang/jit_kernel/diffusion directory.
• Expanded Codeowners for Multimodal Generation: @yingluosanqian has been added as a codeowner for the /python/sglang/multimodal_gen/runtime/layers and /python/sglang/multimodal_gen/runtime/models/dits directories.

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Changelog

• .github/CODEOWNERS
  • Added new codeowners (@yingluosanqian, @BBuf, @mickqian) for the /python/sglang/jit_kernel/diffusion path.
  • Updated codeowners for /python/sglang/multimodal_gen/runtime/layers to include @yingluosanqian.
  • Updated codeowners for /python/sglang/multimodal_gen/runtime/models/dits to include @yingluosanqian.

Activity

• No specific review comments or activity have been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

This pull request updates the CODEOWNERS file to reflect ownership changes for diffusion-related code. The changes are mostly correct, but I've identified an opportunity to improve the ownership consistency. Specifically, some diffusion-related files under jit_kernel are not covered by the new rules. I've provided a suggestion to add explicit ownership for these files to ensure future reviews are routed to the correct team members.

[gemini-code-assist]

Based on the provided context files, python/sglang/jit_kernel/timestep_embedding.py and its test file are also part of the diffusion feature set. However, they are not located under the diffusion/ subdirectory and thus won't be covered by this new rule, falling back to the parent directory's owners. To ensure consistent ownership for all diffusion-related code under jit_kernel, consider adding explicit ownership rules for these files as well.

/python/sglang/jit_kernel/diffusion @yingluosanqian @BBuf @mickqian
/python/sglang/jit_kernel/timestep_embedding.py @yingluosanqian @BBuf @mickqian
/python/sglang/jit_kernel/tests/test_timestep_embedding.py @yingluosanqian @BBuf @mickqian