[codex] ci: replace hand-rolled cache with Swatinem/rust-cache#516
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Summary
Replace the hand-rolled Cargo cache step in CI with
Swatinem/rust-cache@v2.Why
The current workflow caches
~/.cargoand./targetagainst only theCargo.lockhash, which causes fully cold rebuilds whenever the lockfile changes and keeps stale build artifacts around.Swatinem/rust-cacheuses Rust toolchain and workspace-aware keys, restores more effectively across lockfile changes, and prunes old artifacts to keep cache size under control.Closes #411.
Validation
This change only updates the GitHub Actions workflow definition. I verified the resulting diff is limited to
.github/workflows/ci.ymland replaces the manualactions/cacheblock withSwatinem/rust-cache@v2.