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cfde5cf1 - ci: replace aqua tool downloads with dedicated GitHub Actions (#2712)

ci: replace aqua tool downloads with dedicated GitHub Actions (#2712) * ci: replace aqua tool downloads with dedicated GitHub Actions Replace fragile aqua downloads from GitHub Releases with dedicated actions that are more reliable: - gotestsum: go install via Go module proxy (avoids GitHub Releases entirely) - cargo-deny: taiki-e/install-action (prebuilt with checksum verification) - cargo-nextest: taiki-e/install-action (prebuilt with checksum verification) - coglet wheel build: PyO3/maturin-action (bundles maturin + zig) This eliminates transient 502 errors from GitHub Releases during CI, removes mise as a dependency from build-rust, test-rust, test-go, and lint-rust-deny jobs, and makes the coglet wheel build consistent with the release pipeline. Tools remain available via aqua in mise.toml for local development. * docs: document CI tool dependency management Add sections to both AGENTS.md and CONTRIBUTING.md explaining the dual-maintenance requirement for tool versions between mise.toml (local dev) and ci.yaml (CI), including the table of CI-specific installation methods and why each avoids aqua/GitHub Releases.