[sgl-kernel] Fix MUSA wheel METADATA version to match +musa<suffix> filename

[Kangyan-Zhou]

Summary

The MUSA wheel rename script only renames the .whl file (inserting +musa43 into the filename) but leaves the dist-info METADATA Version: field untouched. pip 22.2+ rejects such wheels with:

inconsistent version: expected '0.4.2.post1+musa43', but metadata has '0.4.2.post1'

This means pip install sglang-kernel --index-url https://docs.sglang.io/whl/musa43 currently fails for every published MUSA wheel (v0.4.1.post1, v0.4.2, v0.4.2.post1).

The CUDA companion sgl-kernel/rename_wheels.sh already handles this correctly (unpack → patch METADATA + WHEEL → wheel pack to regenerate RECORD). This PR ports that flow to scripts/ci/musa/rename_wheels_musa.sh.

Changes

• scripts/ci/musa/rename_wheels_musa.sh:
  • Unpack each wheel via python -m wheel unpack.
  • Patch WHEEL Tag: line so linux_* is rewritten to manylinux2014_* in lockstep with the filename.
  • Patch METADATA Version: line to append +musa<suffix>.
  • Rename the .dist-info directory.
  • Repack via python -m wheel pack (regenerates RECORD checksums).
  • Idempotent: a rerun on an already-suffixed wheel skips it.
  • Defensive assertions on each step (non-empty Version:, substitution actually landed, dist-info dir actually renamed) so a malformed wheel surfaces a clear error instead of a misleading sed: /WHEEL failure downstream.

Test Plan

Local sanity-check (cannot run the full MUSA CI from this environment):

• Built a synthetic sglang-kernel-0.4.2.post2-cp310-none-linux_x86_64.whl and ran the script with 43 as the suffix arg.
• Verified the resulting dist/ wheel:
  • Filename: sglang_kernel-0.4.2.post2+musa43-cp310-none-manylinux2014_x86_64.whl
  • METADATA Version: 0.4.2.post2+musa43
  • WHEEL Tag: cp310-none-manylinux2014_x86_64
  • RECORD regenerated, hashes consistent.
• pip install --platform manylinux2014_x86_64 --python-version 3.10 --only-binary=:all: ... accepts the wheel — no "inconsistent version" complaint.
• Rerunning the script on the already-patched wheel correctly skips it (idempotency).

For the next release, this script needs to run as part of build-musa43 in .github/workflows/release-whl-kernel.yml:444-450 (it already does — no workflow change needed).

Follow-up

The already-published wheels in sgl-project/whl releases (v0.4.1.post1, v0.4.2, v0.4.2.post1) still have stale METADATA. They will need either re-uploaded assets or a new patch release before pip install sglang-kernel --index-url ... works for existing MUSA tags.

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CI States

Latest PR Test (Base): ❌ Missing run-ci label — add it to run CI tests.
Latest PR Test (Extra): ❌ Blocked — run-ci is required first.

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[yeahdongcn]

@johnnycxm Please take a look. Thanks!