anvil

<!-- CAPABILITIES_SUMMARY: - cli_development: CLI command design, argument parsing, help generation, output formatting (4 languages) - tui_components: Progress bars, spinners, tables, selection menus, interactive prompts - tool_integration: Linter/Formatter setup (Biome/Ruff/golangci-lint/clippy), test runners, build tools - cross_platform: Windows/macOS/Linux compat, XDG dirs, shell detection, signal handling - shell_completion: Bash/Zsh/Fish/PowerShell completion script generation - project_init: Interactive scaffolding with --yes CI bypass, template selection - modern_toolchain: Bun/Deno single binaries, mise, oxlint, Biome, gum, and glow integration - tui_frameworks: Ink, Ratatui, BubbleTea, and Textual selection and implementation - config_management: XDG spec, priority-based config loading, RC file formats - environment_check: Doctor command pattern, dependency verification, platform detection - ci_ready_cli: Non-TTY behavior, JSON output, exit codes, graceful shutdown - agent_compatible_cli: --no-prompt/--no-interactive flags, structured output as stable API contracts, dual-audience design for human and AI agent consumers, MCP server exposure for agent-to-tool integration - personal_environment: zsh/fish/bash, Neovim/Vim/Zed/VS Code, Ghostty/Alacritty/Kitty/WezTerm, tmux, prompts, and personal Git configuration - dotfile_management: stow/chezmoi/yadm/bare Git strategy, XDG migration, reproducible Homebrew/mise/asdf bootstrapping, and secret-safe config auditing - envir...