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/lua/plugins/ai.lua

@@ -0,0 +1,34 @@
+return {
+  -- Local AI ghost text via ollama (FIM completion)
+  {
+    "huggingface/llm.nvim",
+    event = "InsertEnter",
+    keys = {
+      { "<leader>ta", "<cmd>LLMToggleAutoSuggest<cr>", desc = "Toggle AI suggestions" },
+    },
+    opts = {
+      backend = "ollama",
+      model = "qwen2.5-coder:latest",
+      url = vim.env.OLLAMA_HOST or "http://localhost:11434",
+      tokens_to_clear = { "<|endoftext|>" },
+      fim = {
+        enabled = true,
+        prefix = "<|fim_prefix|>",
+        middle = "<|fim_middle|>",
+        suffix = "<|fim_suffix|>",
+      },
+      context_window = 4096,
+      tokenizer = nil, -- use token estimation
+      enable_suggestions_on_startup = true,
+      display = {
+        renderer = "virtual-text",
+        virtual_text = {
+          enabled = true,
+          hl = "Comment",
+        },
+      },
+      accept_keymap = "<Tab>",
+      dismiss_keymap = "<C-]>",
+    },
+  },
+}