nvim,tmux,kitty: full config overhaul (AstroNvim → native 0.12)

Replaces AstroNvim v5 with from-scratch Neovim 0.12 config using
vim.lsp.config()/vim.lsp.enable() natively, lazy.nvim, blink.cmp,
and smart-splits tmux integration.

tmux: new C-Space prefix, hjkl pane nav, resize key table, tpm plugins.
kitty: add allow_remote_control for smart-splits.

dot_config/nvim/init.lua

@@ -1,19 +1,54 @@
--- This file simply bootstraps the installation of Lazy.nvim and then calls other files for execution
--- This file doesn't necessarily need to be touched, BE CAUTIOUS editing this file and proceed at your own risk.
-local lazypath = vim.env.LAZY or vim.fn.stdpath "data" .. "/lazy/lazy.nvim"
-if not (vim.env.LAZY or (vim.uv or vim.loop).fs_stat(lazypath)) then
-  -- stylua: ignore
-  vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", "--branch=stable", lazypath })
+-- Bootstrap lazy.nvim
+local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
+if not vim.loop.fs_stat(lazypath) then
+  vim.fn.system({
+    "git", "clone", "--filter=blob:none",
+    "https://github.com/folke/lazy.nvim.git",
+    "--branch=stable", lazypath,
+  })
 end
 vim.opt.rtp:prepend(lazypath)
 
--- validate that lazy is available
-if not pcall(require, "lazy") then
-  -- stylua: ignore
-  vim.api.nvim_echo({ { ("Unable to load lazy from: %s\n"):format(lazypath), "ErrorMsg" }, { "Press any key to exit...", "MoreMsg" } }, true, {})
-  vim.fn.getchar()
-  vim.cmd.quit()
+-- Leader must be set before lazy loads plugins
+vim.g.mapleader = " "
+vim.g.maplocalleader = " "
+
+-- Load core config (order matters)
+require("options")
+require("autocmds")
+
+-- Load LSP server configurations (vim.lsp.config calls)
+-- These must run before vim.lsp.enable() in plugins/lsp.lua
+do
+  local lsp_dir = vim.fn.stdpath("config") .. "/lua/lsp"
+  for _, name in ipairs(vim.fn.readdir(lsp_dir)) do
+    if name:match("%.lua$") then
+      require("lsp." .. name:gsub("%.lua$", ""))
+    end
+  end
 end
 
-require "lazy_setup"
-require "polish"
+-- Load colorscheme before plugins (prevents flash of wrong colors)
+-- colors/apex-neon.lua is managed by refresh-apex-themes, not via lazy
+vim.cmd.colorscheme("apex-neon")
+
+-- Setup lazy.nvim
+require("lazy").setup({
+  spec = { { import = "plugins" } },
+  lockfile = vim.fn.stdpath("config") .. "/lazy-lock.json",
+  defaults = { lazy = false },
+  install = { colorscheme = { "apex-neon", "habamax" } },
+  checker = { enabled = false },
+  change_detection = { enabled = false },
+  performance = {
+    rtp = {
+      disabled_plugins = {
+        "gzip", "matchit", "matchparen", "netrwPlugin",
+        "tarPlugin", "tohtml", "tutor", "zipPlugin",
+      },
+    },
+  },
+})
+
+-- Keymaps loaded after lazy so plugin keymaps can be set in their own files
+require("keymaps")