[codex] Remove stale CollectiveX workflow / 删除过时的 CollectiveX 工作流

[Oseltamivir]

Summary

• Remove the obsolete dispatch-only CollectiveX workflow from main.
• Stop exposing runner-specific node and storage metadata in the default branch.
• The workflow was unusable because the corresponding CollectiveX source is not present on main; the reviewed v1 branch will add a sanitized replacement separately.

Validation

• git diff --check
• Confirmed no remaining CollectiveX references under .github/ or experimental/ on this branch.

中文说明

• 从 main 删除过时且仅支持手动触发的 CollectiveX 工作流。
• 避免默认分支继续暴露运行节点和存储路径等基础设施信息。
• 该工作流无法运行，因为 main 中没有对应的 CollectiveX 源码；经过审查的 v1 分支会单独添加已清理的替代工作流。

验证

• git diff --check
• 已确认此分支的 .github/ 和 experimental/ 下不再有 CollectiveX 引用。

[claude]

Claude finished @Oseltamivir's task in 1m 17s —— View job

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Review

• Gather context (diff, deleted workflow contents)
• Check for dangling CollectiveX references on this branch
• Verify the referenced source (experimental/CollectiveX/) is absent on main
• Post review

LGTM - no blocking issues found

Verified the deletion is clean:

• The removed workflow's setup job ran in working-directory: experimental/CollectiveX, which does not exist on main — the workflow was genuinely dead (any dispatch would fail immediately at that step).
• No remaining CollectiveX references anywhere in the repo after this change (checked .github/, experimental/, and the full tree).
• Pure deletion, dispatch-only workflow, nothing else depends on it (no workflow_call/workflow_run consumers).

Removing it also stops exposing runner node names (mia1-p01-g10,mia1-p01-g15) and internal storage paths (/mnt/lustre01/...) from the default branch, as described.

[claude]

Straightforward deletion of an unused workflow file — the referenced experimental/CollectiveX/ directory doesn't exist on main.

Extended reasoning...

Overview

Deletes a single GitHub Actions workflow file (.github/workflows/collectivex-sweep.yml, 154 lines) that was dispatch-only and referenced experimental/CollectiveX/ scripts and launchers. That directory does not exist on main (verified — experimental/ contains only dsv32, kvcache_transfer_DtoH_HtoD, multiturn, single_node_decodeonly, token_position_decode_slo, README.md), so the workflow was unrunnable in its current location. No other references to CollectiveX remain in .github/workflows/.

Security risks

None — this is a pure deletion. It actually reduces information exposure on the default branch by removing hardcoded runner names (mia1-p01-g10, mia1-p01-g15) and internal storage paths (/mnt/lustre01/users-public/sa-shared/cx-stage) that were baked into the workflow env.

Level of scrutiny

Low. This is a mechanical cleanup: a single-file deletion of dead configuration that couldn't run anyway. No logic changes, no dependency changes, no runtime code affected. The PR author notes a sanitized replacement will land on the v1 branch separately.

Other factors

Bug hunting agent found no issues. The change is fully self-contained and trivially reversible via git if the removal turns out to be premature.