feat: Add LLM integration and improve Emacs configuration

- Add gptel and gptel-magit packages for AI-powered Git commits and
- chat Add org-roam and org-roam-ui for better note-taking and
- knowledge management Add benchmark-init to measure startup
- performance Add winum for window navigation with keybindings Add
- vterm for better terminal emulation Configure exec-path-from-shell
- to inherit shell environment Add org-roam.db to gitignore Set
- use-short-answers for yes/no prompts Add org-todo-list keybinding
- and update magit binding Configure org-agenda-files to include org
- directory Remove commented eat package configuration

lisp/init-llm.el

@@ -0,0 +1,16 @@
+;;; -*- lexical-binding: t; -*-
+
+(use-package gptel
+  :defer t
+  :bind (("C-c l s" . gptel-send)
+	 ("C-c l m" . gptel-menu))
+  :config
+  (setq gptel-model 'claude-sonnet-4.5)
+  (setq gptel-backend (gptel-make-gh-copilot "Copilot"))
+  (setq gptel-display-buffer-action nil)  ; if user changes this, popup manager will bow out
+  )
+
+(use-package gptel-magit
+  :hook (magit-mode . gptel-magit-install))
+
+(provide 'init-llm)