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b29b3aba - ci: fix mise cache issues — per-job keys and rustup component safety net

ci: fix mise cache issues — per-job keys and rustup component safety net Two issues with the mise-action cache after #2951: 1. ~/.rustup is NOT included in the mise cache (~/.local/share/mise). On cache hit, mise sees rust as 'installed' (symlink exists) but the actual rustup toolchain components (rustfmt, clippy) are missing. Fix: Rust jobs now run 'rustup component add rustfmt clippy' after mise-action to ensure components are present regardless of cache state. 2. All parallel jobs shared one cache key (mise-v2-{os}-{arch}-{hash}). GitHub Actions cache save is first-writer-wins, causing races. Fix: per-job cache keys (mise-ci-${{ github.job }}) so each job gets its own isolated cache. Also deleted stale mise-v2-* caches.