Why

The fast rust-ci workflow decides whether to run the cross-platform argument-comment-lint job based on changed paths. PRs that touch Rust-adjacent Bazel wrapper files, such as defs.bzl or workspace_root_test_launcher.*.tpl, can change how Rust tests and lint targets behave without changing any .rs files.

When that detector returned false, GitHub skipped the matrix job before expanding it. That produced a single skipped check named Argument comment lint - ${{ matrix.name }} instead of the Linux, macOS, and Windows check names that branch protection expects, leaving the PR unable to go green when those matrix checks are required.

What Changed

• Treat root Bazel wrapper files as argument-comment-lint relevant changes.
• Keep the argument_comment_lint_prebuilt matrix job materialized for every PR so the per-platform check names always exist.
• Add a single gate step that decides whether the real lint work should run.
• Move the checkout-adjacent Bazel setup and OS-specific lint commands into .github/actions/run-argument-comment-lint/action.yml so the workflow does not repeat the same path-detection condition on each step.

Verification

• Parsed .github/workflows/rust-ci.yml and .github/actions/run-argument-comment-lint/action.yml with Python YAML loading.
• Simulated the workflow path-matching shell conditions for the root Bazel wrapper files and confirmed they set argument_comment_lint=true.