Add Emacs desktop provisioning and dev toolchain packages

Install Emacs and copy the desktop .emacs.d config so the editor setup is managed with the rest of desktop dotfiles. Add vterm/build/debug dependencies plus C/C++ and Go tooling needed by the configured workflow.

dotfiles/desktop/.emacs.d/lisp/tools/project.el

@@ -0,0 +1,25 @@
+;;; project.el - lexical-binding *-*
+
+(use-package projectile
+  :ensure t
+  :defer 1
+  :init
+  ;; Root detection
+  (setq projectile-project-search-path '("~/Projects" "~/Work" "~/Progetti" "~/.local/src"))
+  (setq projectile-completion-system 'ivy)
+  :config
+  ;; Performance
+  (setq projectile-enable-caching t)
+  (setq projectile-indexing-method 'hybrid)
+  (setq projectile-sort-order 'recently-active)
+  ;; Projectile as single source of truth
+  (setq projectile-switch-project-action #'projectile-dired)
+  ;; Use ripgrep if available
+  (when (executable-find "rg")
+    (setq projectile-generic-command "rg --files --hidden --glob '!.git'"))
+  ;; Enable globally
+  (projectile-mode 1))
+
+(provide 'project)
+
+;;; project.el ends here