feat: introduce mitamae for cross-platform package installation

mitamae/.gitignore

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+# Downloaded mitamae binary
+bin/

mitamae/bootstrap.sh

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+#!/usr/bin/env bash
+# bootstrap.sh — download mitamae and run the package recipe
+#
+# Usage: ./mitamae/bootstrap.sh
+#
+# Downloads the mitamae binary for the current platform from GitHub releases,
+# then runs recipe.rb to install packages.
+
+set -euo pipefail
+
+MITAMAE_VERSION="v1.14.4"
+MITAMAE_DIR="$(cd "$(dirname "$0")" && pwd)"
+MITAMAE_BIN="${MITAMAE_DIR}/bin/mitamae"
+
+# --- Detect platform ---
+detect_platform() {
+  local os arch
+
+  case "$(uname -s)" in
+    Darwin) os="darwin" ;;
+    Linux)  os="linux" ;;
+    *)
+      echo "Unsupported OS: $(uname -s)" >&2
+      exit 1
+      ;;
+  esac
+
+  case "$(uname -m)" in
+    x86_64|amd64)  arch="x86_64" ;;
+    aarch64|arm64) arch="aarch64" ;;
+    *)
+      echo "Unsupported architecture: $(uname -m)" >&2
+      exit 1
+      ;;
+  esac
+
+  echo "${arch}-${os}"
+}
+
+# --- Download mitamae ---
+download_mitamae() {
+  if [[ -x "${MITAMAE_BIN}" ]]; then
+    local current_version
+    current_version=$("${MITAMAE_BIN}" version 2>/dev/null || echo "unknown")
+    if [[ "${current_version}" == *"${MITAMAE_VERSION#v}"* ]]; then
+      echo "✓ mitamae ${MITAMAE_VERSION} already installed"
+      return
+    fi
+  fi
+
+  local platform
+  platform="$(detect_platform)"
+  local url="https://github.com/itamae-kitchen/mitamae/releases/download/${MITAMAE_VERSION}/mitamae-${platform}"
+
+  echo "→ Downloading mitamae ${MITAMAE_VERSION} for ${platform}..."
+  mkdir -p "${MITAMAE_DIR}/bin"
+  curl -fsSL -o "${MITAMAE_BIN}" "${url}"
+  chmod +x "${MITAMAE_BIN}"
+  echo "✓ mitamae installed to ${MITAMAE_BIN}"
+}
+
+# --- Main ---
+echo ""
+echo "  mitamae bootstrap"
+echo "  ================="
+echo ""
+
+download_mitamae
+
+echo ""
+echo "→ Running recipe..."
+echo ""
+
+exec "${MITAMAE_BIN}" local "${MITAMAE_DIR}/recipe.rb"

mitamae/recipe.rb

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+# recipe.rb — cross-platform package installation
+#
+# Uses mitamae's `package` resource which auto-detects the package manager:
+#   - Homebrew on macOS
+#   - apt on Debian/Ubuntu Linux
+#
+# Run via: mitamae local recipe.rb
+
+# --- Helpers ---
+def macos?
+  node[:platform] == "darwin"
+end
+
+def linux?
+  node[:platform] == "linux"
+end
+
+# --- Core packages ---
+# These are needed on all platforms.
+
+package "neovim" do
+  not_if "which nvim"
+end
+
+package "gh" do
+  not_if "which gh"
+end
+
+package "tmux" do
+  not_if "which tmux"
+end
+
+package "ripgrep" do
+  not_if "which rg"
+end
+
+package "fzf" do
+  not_if "which fzf"
+end
+
+# --- mise (polyglot version manager) ---
+# mise isn't in most distro repos, so install via its official script.
+execute "install mise" do
+  command "curl -fsSL https://mise.jdx.dev/install.sh | sh"
+  not_if "which mise"
+end
+
+# --- macOS-only packages ---
+if macos?
+  # Ghostty is distributed as a macOS app (brew cask)
+  execute "install ghostty" do
+    command "brew install --cask ghostty"
+    not_if "brew list --cask ghostty >/dev/null 2>&1"
+  end
+end