Add return 0 as the last statement in ~46 shell functions across 17 files that previously relied on implicit return codes (SonarCloud rule shelldre:S7682).
Install essential developer packages via apt: - Build tools: build-essential, cmake, pkg-config, autoconf, automake, libtool - Dev libraries: libssl-dev, libffi-dev, zlib1g-dev, libreadline-dev, etc. - CLI utilities: jq, tmux, tree, unzip, shellcheck, socat, gnupg Curated to avoid duplicates with cargo/go installs (ripgrep, fd, fzf, etc.). Uses batched apt install for efficiency, exits gracefully on non-Debian systems.
