[AMD][CI] Retire the ROCm 7.0 kernel wheel

[michaelzhang-ai]

Motivation

#38763 added a ROCm 10 kernel wheel, making the ROCm wheel matrix ["700", "720", "1000"]. rocm700 is now the only leg with no CI behind it, and it is the last ROCm 7.0 artifact SGLang still publishes on every kernel version bump.

Scope note: this PR was originally a broader ROCm 7.0 retirement (workflows, nightly image build, release image matrix). #38632 supersedes all of that with a better end state — it consolidates the AMD workflows back onto a single pr-test-amd.yml / nightly-test-amd.yml pair and retires ROCm 7.0 CI as a consequence. Rather than conflict with it on the same four workflow files, this PR is now reduced to the one ROCm 7.0 surface #38632 does not touch: the kernel wheel.

Modifications

Retire the ROCm 7.0 kernel wheel end-to-end:

• .github/workflows/release-whl-kernel.yml: drop the rocm700 dispatch option, the rocm700 clause in the build-rocm-matrix guard, the "700" matrix entry, and the release-rocm700 job (which published the artifact and ran update_kernel_whl_index.py --rocm 700). The ROCm wheel matrix becomes ["720", "1000"].
• 3rdparty/amd/wheel/sgl-kernel/build_rocm.sh: drop the 700 build image (lmsysorg/sglang:v0.5.8.post1-rocm700-mi35x) and its pinned rocm-rel-7.0.2 torch/triton/torchaudio/torchvision install branch. 720 and 1000 are unchanged, and an explicit 700 argument now fails with a clear message.
• 3rdparty/amd/wheel/sglang/pyproject.toml: remove the rocm700 optional-dependency extra (which pinned sglang_kernel-0.4.0+rocm700) and the stale install comment. rocm720 is unchanged.
• 3rdparty/amd/wheel/README.md: remove the ROCm 7.0.0 pip install "amd-sglang[all-hip,rocm700]" recipe and the ROCm 7.0.0 Triton upgrade note, and correct the extras description. Also fixes the section heading typo Revolving triton → Resolving triton.

#38763's ROCm 10 wheel path is untouched.

What this does not touch

The remaining ROCm 7.0 references are deliberately out of scope:

• The ROCm 7.0 workflows, nightly image build, and release-docker-amd.yml matrix leg — all handled by [AMD][CI] Consolidate AMD workflows and retire ROCm 7.0 CI #38632.
• scripts/ci/amd/amd_ci_start_container*.sh still default to ROCM_VERSION=rocm700. This cannot change independently: all 58 container-launch sites in the current pr-test-amd.yml / nightly-test-amd.yml omit --rocm-version and rely on that default, so flipping it to rocm10 before those workflows are deleted would silently repoint the ROCm 7.0 runs at ROCm 10 images. It belongs with [AMD][CI] Consolidate AMD workflows and retire ROCm 7.0 CI #38632 or a follow-up.
• docker/rocm.Dockerfile retains the unsuffixed gfx942 / gfx950 ROCm 7.0 stages for local builds.
• SGLANG_USE_ROCM700A is misleadingly named but gates a workaround current ROCm 7.2 images still set.
• Cookbook pages pin historical rocm700 image tags for reproducibility.

Accuracy Tests

Not applicable — release-artifact configuration only; no runtime or kernel code changed.

Speed Tests and Profiling

Not applicable. Removes one wheel build leg on the shared amd-docker-scale node plus its release job from every kernel version bump.

Verification

• No rocm700, ROCm 7.0 dependency URL, "700" build input, or --rocm 700 remains in release-whl-kernel.yml or 3rdparty/amd/wheel/.
• release-whl-kernel.yml parses as YAML; the surviving legs are rocm720 / rocm1000 in the dispatch menu, the ["720", "1000"] matrix, and the release-rocm720 / release-rocm1000 jobs.
• build_rocm.sh passes bash -n; 720 and 1000 still resolve their images, and 700 exits 1 with Only '720' and '1000' are supported.
• pyproject.toml parses with tomllib; the only remaining rocm* extra is rocm720.
• python3 scripts/lint/check_workflow_job_names.py passes.

Checklist

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

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CI States

Latest PR Test (Base): ✅ Run #34489631801
Latest PR Test (Extra): ❌ Run #34489631335
Latest PR Test (AMD ROCm 10): ➖ No AMD PR run found for this commit.