New `metacfg.services.opencode` module under modules/nixos/services/opencode/
with options for port, user, homeDir, sopsFile, and extraPackages. User and
homeDir default off `metacfg.user`. Host configs for amd and sgx reduce to
enabling the module and pointing at their respective sops file.
Service PATH gains jq, yq-go, python3, gh, gnutar, gzip, unzip, wget,
diffutils, patch, file, tree, bun, uv, ast-grep, claude-code, and tmux for
agent ergonomics.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
