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/lsp.el

@@ -0,0 +1,49 @@
+;;; lsp.el -*- lexical-binding: t; -*-
+
+(use-package lsp-mode
+  :ensure t
+  :commands (lsp lsp-deferred)
+  :hook
+  ((c-mode
+    c-ts-mode
+    c++-mode
+    c++-ts-mode
+    python-mode
+    python-ts-mode
+    sh-mode
+    bash-ts-mode) . lsp-deferred)
+  :config
+  ;; Performance
+  (setq lsp-enable-symbol-highlighting t
+	lsp-enable-snippet t
+	lsp-log-io nil
+	lsp-modeline-code-actions-enable nil
+	lsp-modeline-diagnostics-enable nil
+	lsp-signature-auto-activate nil
+	lsp-enable-on-type-formatting nil
+        lsp-completion-provider :capf
+	lsp-diagnostics-provider :flycheck
+        lsp-headerline-breadcrumb-enable nil
+	lsp-enable-indentation nil
+	;; Disable for huge projects
+	lsp-enable-file-watchers nil
+        lsp-idle-delay 0.5))
+
+(use-package lsp-ui
+  :ensure t
+  :config
+  (setq lsp-ui-doc-enable t
+      lsp-ui-doc-delay 0.3
+      lsp-ui-sideline-enable t
+      lsp-ui-sideline-show-code-actions t))
+
+(use-package consult-lsp
+  :ensure t
+  :after (consult lsp-mode)
+  :commands
+  (consult-lsp-symbols
+   consult-lsp-diagnostics))
+
+(provide 'lsp)
+
+;;; lsp.el ends here