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9b48e7f4 - ci: use mise-action as single tool installer across all workflows (#2951)

ci: use mise-action as single tool installer across all workflows (#2951) * ci: use mise-action as single tool installer across all workflows Replace ~10 different GitHub Actions (dtolnay/rust-toolchain, taiki-e/install-action, astral-sh/setup-uv, actions/setup-go, golangci/golangci-lint-action, mlugg/setup-zig, etc.) with jdx/mise-action@v4 so tool versions are defined in one place (mise.toml) instead of two. Kept exceptions: - PyO3/maturin-action: builds inside manylinux container - Swatinem/rust-cache: caches crates/target/ (compilation, not tools) - actions/setup-python in check-stubs: needs shared-library Python * ci: fix mise cache save races with cache_save: false The setup job warms the mise tool cache (cache_save: true by default). All other jobs set cache_save: false so they only restore from cache without racing to save the same key. Exception: test-go on macOS saves its own cache since it's the only job on that platform (different cache key). * Revert "ci: fix mise cache save races with cache_save: false" This reverts commit d4ffea642b05683c67ccd8698444942be6a295f6. * ci: remove MISE_DISABLE_TOOLS — mise needs rustup for components Rust components (rustfmt, clippy) are installed via rustup during `mise install`. Disabling rustup/rustup-init caused cargo-fmt and cargo-clippy to be missing, failing Format Rust and Lint Rust jobs. * ci: bust stale mise cache with v2 prefix The previous cache (mise-v1) was poisoned by MISE_DISABLE_TOOLS which prevented rustfmt/clippy from being installed. Bumping to mise-v2 forces a fresh install with all components.