Initial chezmoi-managed dotfiles with bootstrap scripts

- Rename master to legacy-2025 on remote (frozen pre-chezmoi snapshot)
- New orphan 'main' branch with bootstrap-enabled config
- .chezmoi.yaml.tmpl detects os_family (debian | arch) from /etc/os-release
- dot_zshrc.tmpl refactored from current miche config with os_family
  conditional for pacman vs apt aliases
- dot_config/: bat, btop, ghostty (with gruvbox themes), kitty (with gruvbox
  colors), nvim (LazyVim), paru
- dot_gitconfig.tmpl, dot_tmux.conf (verbatim from current state)
- run_once_00-install-bootstrap-tools.sh.tmpl: age, git, curl, ca-certificates
- run_once_10-add-chaotic-aur.sh.tmpl (arch-only): add Chaotic-AUR + install paru
- run_once_20-install-user-packages.sh.tmpl: zsh, tmux, neovim (with version
  check + binary tarball fallback for debian), oh-my-zsh + plugins, tpm,
  rustup, all CLI tools
- run_onchange_30-ensure-cargo.sh.tmpl: rustup fallback
- README.md with onboarding runbook

dot_config/nvim/lua/config/lazy.lua

@@ -0,0 +1,47 @@
+local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
+if not vim.loop.fs_stat(lazypath) then
+  -- bootstrap lazy.nvim
+  -- stylua: ignore
+  vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", "--branch=stable", lazypath })
+end
+vim.opt.rtp:prepend(vim.env.LAZY or lazypath)
+
+require("lazy").setup({
+  spec = {
+    -- add LazyVim and import its plugins
+    { "LazyVim/LazyVim", import = "lazyvim.plugins" },
+    -- import any extras modules here
+    -- { import = "lazyvim.plugins.extras.lang.typescript" },
+    -- { import = "lazyvim.plugins.extras.lang.json" },
+    -- { import = "lazyvim.plugins.extras.ui.mini-animate" },
+    -- import/override with your plugins
+    { import = "lazyvim.plugins.extras.lang.python" },
+    { import = "plugins" },
+  },
+  defaults = {
+    -- By default, only LazyVim plugins will be lazy-loaded. Your custom plugins will load during startup.
+    -- If you know what you're doing, you can set this to `true` to have all your custom plugins lazy-loaded by default.
+    lazy = false,
+    -- It's recommended to leave version=false for now, since a lot the plugin that support versioning,
+    -- have outdated releases, which may break your Neovim install.
+    version = false, -- always use the latest git commit
+    -- version = "*", -- try installing the latest stable version for plugins that support semver
+  },
+  install = { colorscheme = { "tokyonight", "habamax" } },
+  checker = { enabled = true }, -- automatically check for plugin updates
+  performance = {
+    rtp = {
+      -- disable some rtp plugins
+      disabled_plugins = {
+        "gzip",
+        -- "matchit",
+        -- "matchparen",
+        -- "netrwPlugin",
+        "tarPlugin",
+        "tohtml",
+        "tutor",
+        "zipPlugin",
+      },
+    },
+  },
+})