ci: macOS Native host build fails with 'cargo metadata: unexpected argument' (rust-cache)

[carlos-alm]

Problem

The Native host build (macos-latest) job in .github/workflows/ci.yml consistently fails on the Build native addon step with:

Internal Error: cargo metadata exited with code 1 and error message:
error: error: unexpected argument 'metadata' found

This blocks merges on multiple open PRs (observed on #1128, #1119, etc.) without any code change being responsible.

Reproduction

Any push to a PR with native Rust changes triggers it. Examples:

• PR fix(julia): port parameterized-type / qualified-def / qualified-import fixes to WASM #1128 run https://github.com/optave/ops-codegraph-tool/actions/runs/25901674147/job/76126123746
• PR fix(scripts): preserve manual NOTES block in incremental report generator #1119 run https://github.com/optave/ops-codegraph-tool/actions/runs/25901681055/job/76126181333

Suspected cause

The macOS runner appears to resolve cargo to a binary that doesn't accept the metadata subcommand. Most likely culprit: the Install napi-rs CLI step installs a global napi binary, but somewhere in the path resolution a wrong cargo is picked up by Swatinem/rust-cache (which calls cargo metadata internally).

Suggested fix

Investigate PATH ordering on macOS runners; pin rust-cache and napi-rs versions; consider adding a debug step that runs which cargo && cargo --version before rust-cache.

Context

Filed during sweep of PR #1128. The PR itself has no Rust toolchain changes — the failure is environmental.

[carlos-alm]

Also observed on the Build x86_64-apple-darwin cross-compilation job (job 76126970697 on PR #1128 run 25901950324), not just Native host build (macos-latest). Both run on macOS runners and both fail with the same cargo metadata: unexpected argument error inside Swatinem/rust-cache.

[heinrich5991]

Seems to be an upstream github actions issue: actions/runner-images#14097 (rust-lang/rustup#4856).