Rebuild dotfiles as one branch with per-host layers

Replaces the previous repo, which had split into two histories that never
met (mainframe on a dead GitLab remote, the laptops on Gitea) with 146
dirty files across three machines and the NAS never enrolled at all.

Branch-per-machine is gone. One main, with host differences expressed as
small files under hosts/<hostname>/ rather than as branches, so there is
nothing to merge. The reconciled zsh layer reduces 15-33 line forks to
1-7 effective lines per host; distro differences (oh-my-zsh prefix,
syntax-highlighting path, fd vs fdfind) are probed in common/ instead.

Fresh history: the old one carried six plaintext credentials, 45 MB of
mail caches, browser caches and vendored binaries. 5,096 tracked files
and 144 MB become 462 files and 2.6 MB. The .gitignore is now an
allowlist, which is what keeps that true.

Root cause of the rot: ~/.local/bin was a symlink to scripts/ with GOPATH
inside it, so every go install wrote into version control (2.2 GB on the
work laptop). PATH now points at the repo instead of the reverse.

Also: Hyprland replaces sway and is sourced in two halves so $browser is
defined before use; singleton automations carry ConditionHost= alongside
host-layer-only placement; ddns moves from cron to a guarded timer;
package manifests and pkg-snapshot/pkg-restore replace the X11-era
install_scripts/; networkmanager-dmenu added to system76 (the binding
always existed, the package never did).

common/nvim/init.lua

@@ -0,0 +1,149 @@
+--  .d8888b.                                                     888888          888                        888
+-- d88P  Y88b                                                      "88b          888                        888
+-- 888    888                                                       888          888                        888
+-- 888         .d88b.  88888b.  88888b.   .d88b.  888d888           888  .d88b.  88888b.  88888b.  .d8888b  888888 .d88b.  88888b.   .d88b.
+-- 888        d88''88b 888 '88b 888 '88b d88''88b 888P"             888 d88''88b 888 '88b 888 '88b 88K      888   d88''88b 888 '88b d8P  Y8b
+-- 888    888 888  888 888  888 888  888 888  888 888               888 888  888 888  888 888  888 'Y8888b. 888   888  888 888  888 88888888
+-- Y88b  d88P Y88..88P 888  888 888  888 Y88..88P 888               88P Y88..88P 888  888 888  888      X88 Y88b. Y88..88P 888  888 Y8b.
+--  'Y8888P"   'Y88P'  888  888 888  888  'Y88P'  888               888  'Y88P'  888  888 888  888  88888P'  'Y888 'Y88P'  888  888  'Y8888
+--                                                                .d88P
+--                                                              .d88P"
+--                                                             888P"
+--
+
+-- ------------------------------------------------------------------------------
+-- General Settings
+-- ------------------------------------------------------------------------------
+
+vim.opt.number = true
+vim.opt.relativenumber = true
+vim.opt.tabstop = 4
+vim.opt.softtabstop = 4
+vim.opt.shiftwidth = 4
+vim.opt.expandtab = true
+vim.opt.splitbelow = true
+vim.opt.splitright = true
+vim.opt.scrolloff = 5
+vim.opt.sidescrolloff = 5
+-- vim.opt.cmdheight = 2
+vim.opt.diffopt = "vertical,closeoff,context:6"
+vim.opt.clipboard = "unnamedplus"
+vim.opt.mouse = "nv"
+vim.opt.ignorecase = true
+vim.opt.smartcase = true
+vim.opt.spell = false
+vim.opt.list = true
+vim.opt.joinspaces = false
+vim.opt.breakindent = true
+vim.opt.undofile = true
+vim.opt.completeopt = "menuone,noselect"
+vim.opt.termguicolors = true
+vim.opt.guifont = "RobotoMono Nerd Font:h11"
+vim.opt.signcolumn = "yes"
+vim.opt.winborder = "rounded"
+vim.g.mapleader = " "
+vim.g.maplocalleader = ","
+vim.g.leader = " "
+
+-- ------------------------------------------------------------------------------
+-- PlugIns
+-- ------------------------------------------------------------------------------
+
+vim.pack.add({
+    { src = "https://github.com/vague2k/vague.nvim" },
+    { src = "https://github.com/mason-org/mason.nvim" },
+    { src = "https://github.com/neovim/nvim-lspconfig" },
+    { src = "https://github.com/stevearc/oil.nvim" },
+    { src = "https://github.com/nvim-telescope/telescope.nvim" },
+    { src = "https://github.com/nvim-lua/plenary.nvim" },
+    -- { src = "https://github.com/github/copilot.vim" },
+    { src = "https://github.com/kdheepak/lazygit.nvim" },
+    { src = "https://github.com/tpope/vim-surround" },
+    { src = "https://github.com/tpope/vim-repeat" },
+    { src = "https://github.com/tommcdo/vim-lion" },
+    { src = "https://github.com/andythigpen/nvim-coverage" },
+    { src = "https://github.com/nvim-treesitter/nvim-treesitter" },
+})
+
+require("mason").setup()
+require("oil").setup()
+require("telescope").setup({ pickers = { colorscheme = { enable_preview = true } } })
+require("coverage").setup({
+    auto_reload = true,
+    signs = {
+        covered = { text = "█", texthl = "CoverageCovered" },
+        uncovered = { text = "█", texthl = "CoverageUncovered" },
+        partial = { text = "█", texthl = "CoveragePartial" },
+    },
+})
+require("nvim-treesitter").setup( {
+    ensure_installed = { "lua", "python", "rust", "markdown", "markdown_inline", "julia" },
+    highlight = { enable = true },
+})
+
+vim.lsp.enable({ "lua_ls", "rust_analyzer", "julials", "pylsp", "black", "marksman", "ruff", "clangd" })
+vim.lsp.config("rust_analyzer", {
+    settings = {
+        ["rust-analyzer"] = {
+            cargo = { features = "all" },
+        }
+    }
+})
+
+vim.cmd("colorscheme vague")
+
+-- KEYMAPS
+-- -------------------------------------------------------------------------------
+
+local builtin = require('telescope.builtin')
+vim.keymap.set("n", "<leader>f", vim.lsp.buf.format, { desc = "[f]ormat the current file" })
+vim.keymap.set("n", "<leader>sr", builtin.oldfiles, { desc = "[s]earch [r]ecent files" })
+vim.keymap.set("n", "<leader>sf", builtin.find_files, { desc = "[s]earch files" })
+vim.keymap.set("n", "<leader>sw", builtin.grep_string, { desc = "[s]earch [w]ord with grep" })
+vim.keymap.set("n", "<leader>sg", builtin.live_grep, { desc = "[s]earch with [g]rep" })
+vim.keymap.set('n', "<leader>sh", builtin.help_tags, { desc = "[s]earch [h]elp" })
+vim.keymap.set('n', "<leader>sc", builtin.colorscheme, { desc = "[s]earch [c]olorschemes" })
+vim.keymap.set('i', "jk", "<Esc>", { desc = "Escape, as in [j]ust [k]idding" })
+vim.keymap.set('n', "<leader>o", ":Oil<CR>", { desc = "Run [O]il" })
+vim.keymap.set('n', "<leader> ", ":nohlsearch<CR>", { desc = "Run [O]il" })
+vim.keymap.set('n', "n", "nzz", { desc = "Move next search result to center of screen" })
+vim.keymap.set('n', "N", "Nzz", { desc = "Move prev search result to center of screen" })
+vim.keymap.set('n', "<leader>e", vim.diagnostic.open_float, { desc = "Open up the [e]rror" })
+vim.keymap.set('n', "<leader>lg", ":LazyGitCurrentFile<CR>", { desc = "Open up [l]azy [g]it" })
+vim.keymap.set('n', "<leader>ml", "0dwI<BS> <Esc>", { desc = "[M]erge lines" })
+vim.keymap.set('n', "j", "gj", { desc = "Down visually" })
+vim.keymap.set('n', "k", "gk", { desc = "Up visually" })
+
+
+-- LSP KEYMAPS/CONFIG
+-------------------------------------------------------------------------------
+-- Use LspAttach autocommand to only map the following keys
+-- after the language server attaches to the current buffer
+vim.api.nvim_create_autocmd('LspAttach', {
+  group = vim.api.nvim_create_augroup('UserLspConfig', {}),
+  callback = function(ev)
+    -- Enable completion triggered by <c-x><c-o>
+    vim.bo[ev.buf].omnifunc = 'v:lua.vim.lsp.omnifunc'
+
+    -- Buffer local mappings.
+    -- See `:help vim.lsp.*` for documentation on any of the below functions
+    local opts = { buffer = ev.buf }
+    vim.keymap.set('n', 'gr', builtin.lsp_references, opts)
+    vim.keymap.set('n', 'gd', vim.lsp.buf.definition, opts)
+    vim.keymap.set('n', '<leader>k', vim.lsp.buf.hover, opts)
+    vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, opts)
+    vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, opts)
+    vim.keymap.set('n', '<space>wa', vim.lsp.buf.add_workspace_folder, opts)
+    vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder, opts)
+    vim.keymap.set('n', '<space>wl', function()
+      print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
+    end, opts)
+    vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, opts)
+    vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, opts)
+    vim.keymap.set({ 'n', 'v' }, '<space>ca', vim.lsp.buf.code_action, opts)
+    vim.keymap.set('n', 'gr', vim.lsp.buf.references, opts)
+    vim.keymap.set('n', '<space>f', function()
+      vim.lsp.buf.format { async = true }
+    end, opts)
+  end,
+})